/*----------------------------------------------------------------------------/
/  FatFs - FAT file system module  R0.10c                (C)ChaN, 2014
/-----------------------------------------------------------------------------/
/ FatFs module is a generic FAT file system module for small embedded systems.
/ This is a free software that opened for education, research and commercial
/ developments under license policy of following terms.
/
/  Copyright (C) 2014, ChaN, all right reserved.
/
/ * The FatFs module is a free software and there is NO WARRANTY.
/ * No restriction on use. You can use, modify and redistribute it for
/   personal, non-profit or commercial products UNDER YOUR RESPONSIBILITY.
/ * Redistributions of source code must retain the above copyright notice.
/
/-----------------------------------------------------------------------------/
/ Feb 26,'06 R0.00  Prototype.
/
/ Apr 29,'06 R0.01  First stable version.
/
/ Jun 01,'06 R0.02  Added FAT12 support.
/                   Removed unbuffered mode.
/                   Fixed a problem on small (<32M) partition.
/ Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
/
/ Sep 22,'06 R0.03  Added f_rename().
/                   Changed option _FS_MINIMUM to _FS_MINIMIZE.
/ Dec 11,'06 R0.03a Improved cluster scan algorithm to write files fast.
/                   Fixed f_mkdir() creates incorrect directory on FAT32.
/
/ Feb 04,'07 R0.04  Supported multiple drive system.
/                   Changed some interfaces for multiple drive system.
/                   Changed f_mountdrv() to f_mount().
/                   Added f_mkfs().
/ Apr 01,'07 R0.04a Supported multiple partitions on a physical drive.
/                   Added a capability of extending file size to f_lseek().
/                   Added minimization level 3.
/                   Fixed an endian sensitive code in f_mkfs().
/ May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
/                   Added FSINFO support.
/                   Fixed DBCS name can result FR_INVALID_NAME.
/                   Fixed short seek (<= csize) collapses the file object.
/
/ Aug 25,'07 R0.05  Changed arguments of f_read(), f_write() and f_mkfs().
/                   Fixed f_mkfs() on FAT32 creates incorrect FSINFO.
/                   Fixed f_mkdir() on FAT32 creates incorrect directory.
/ Feb 03,'08 R0.05a Added f_truncate() and f_utime().
/                   Fixed off by one error at FAT sub-type determination.
/                   Fixed btr in f_read() can be mistruncated.
/                   Fixed cached sector is not flushed when create and close without write.
/
/ Apr 01,'08 R0.06  Added fputc(), fputs(), fprintf() and fgets().
/                   Improved performance of f_lseek() on moving to the same or following cluster.
/
/ Apr 01,'09 R0.07  Merged Tiny-FatFs as a configuration option. (_FS_TINY)
/                   Added long file name feature.
/                   Added multiple code page feature.
/                   Added re-entrancy for multitask operation.
/                   Added auto cluster size selection to f_mkfs().
/                   Added rewind option to f_readdir().
/                   Changed result code of critical errors.
/                   Renamed string functions to avoid name collision.
/ Apr 14,'09 R0.07a Separated out OS dependent code on reentrant cfg.
/                   Added multiple sector size feature.
/ Jun 21,'09 R0.07c Fixed f_unlink() can return FR_OK on error.
/                   Fixed wrong cache control in f_lseek().
/                   Added relative path feature.
/                   Added f_chdir() and f_chdrive().
/                   Added proper case conversion to extended character.
/ Nov 03,'09 R0.07e Separated out configuration options from ff.h to ffconf.h.
/                   Fixed f_unlink() fails to remove a sub-directory on _FS_RPATH.
/                   Fixed name matching error on the 13 character boundary.
/                   Added a configuration option, _LFN_UNICODE.
/                   Changed f_readdir() to return the SFN with always upper case on non-LFN cfg.
/
/ May 15,'10 R0.08  Added a memory configuration option. (_USE_LFN = 3)
/                   Added file lock feature. (_FS_SHARE)
/                   Added fast seek feature. (_USE_FASTSEEK)
/                   Changed some types on the API, XCHAR->TCHAR.
/                   Changed .fname in the FILINFO structure on Unicode cfg.
/                   String functions support UTF-8 encoding files on Unicode cfg.
/ Aug 16,'10 R0.08a Added f_getcwd().
/                   Added sector erase feature. (_USE_ERASE)
/                   Moved file lock semaphore table from fs object to the bss.
/                   Fixed a wrong directory entry is created on non-LFN cfg when the given name contains ';'.
/                   Fixed f_mkfs() creates wrong FAT32 volume.
/ Jan 15,'11 R0.08b Fast seek feature is also applied to f_read() and f_write().
/                   f_lseek() reports required table size on creating CLMP.
/                   Extended format syntax of f_printf().
/                   Ignores duplicated directory separators in given path name.
/
/ Sep 06,'11 R0.09  f_mkfs() supports multiple partition to complete the multiple partition feature.
/                   Added f_fdisk().
/ Aug 27,'12 R0.09a Changed f_open() and f_opendir() reject null object pointer to avoid crash.
/                   Changed option name _FS_SHARE to _FS_LOCK.
/                   Fixed assertion failure due to OS/2 EA on FAT12/16 volume.
/ Jan 24,'13 R0.09b Added f_setlabel() and f_getlabel().
/
/ Oct 02,'13 R0.10  Added selection of character encoding on the file. (_STRF_ENCODE)
/                   Added f_closedir().
/                   Added forced full FAT scan for f_getfree(). (_FS_NOFSINFO)
/                   Added forced mount feature with changes of f_mount().
/                   Improved behavior of volume auto detection.
/                   Improved write throughput of f_puts() and f_printf().
/                   Changed argument of f_chdrive(), f_mkfs(), disk_read() and disk_write().
/                   Fixed f_write() can be truncated when the file size is close to 4GB.
/                   Fixed f_open(), f_mkdir() and f_setlabel() can return incorrect error code.
/ Jan 15,'14 R0.10a Added arbitrary strings as drive number in the path name. (_STR_VOLUME_ID)
/                   Added a configuration option of minimum sector size. (_MIN_SS)
/                   2nd argument of f_rename() can have a drive number and it will be ignored.
/                   Fixed f_mount() with forced mount fails when drive number is >= 1.
/                   Fixed f_close() invalidates the file object without volume lock.
/                   Fixed f_closedir() returns but the volume lock is left acquired.
/                   Fixed creation of an entry with LFN fails on too many SFN collisions.
/ May 19,'14 R0.10b Fixed a hard error in the disk I/O layer can collapse the directory entry.
/                   Fixed LFN entry is not deleted on delete/rename an object with lossy converted SFN.
/ Nov 09,'14 R0.10c Added a configuration option for the platforms without RTC. (_FS_NORTC)
/                   Fixed volume label created by Mac OS X cannot be retrieved with f_getlabel().
/                   Fixed a potential problem of FAT access that can appear on disk error.
/                   Fixed null pointer dereference on attempting to delete the root direcotry.
/---------------------------------------------------------------------------*/

#include "ff.h"         /* Declarations of FatFs API */
#include "diskio.h"     /* Declarations of disk I/O functions */




/*--------------------------------------------------------------------------

Module Private Definitions

---------------------------------------------------------------------------*/

#if _FATFS != 80376    /* Revision ID */
#error Wrong include file (ff.h).
#endif


/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration
#endif
#define    ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }
#define    LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else
#define    ENTER_FF(fs)
#define LEAVE_FF(fs, res)   return res
#endif

#define    ABORT(fs, res)      { fp->err = (BYTE)(res); LEAVE_FF(fs, res); }


/* Definitions of sector size */
#if (_MAX_SS < _MIN_SS) || (_MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096) || (_MIN_SS != 512 && _MIN_SS != 1024 && _MIN_SS != 2048 && _MIN_SS != 4096)
#error Wrong sector size configuration
#endif
#if _MAX_SS == _MIN_SS
#define SS(fs)  ((UINT)_MAX_SS) /* Fixed sector size */
#else
#define SS(fs)  ((fs)->ssize)   /* Variable sector size */
#endif


/* Timestamp feature */
#if _FS_NORTC
#define GET_FATTIME()   ((DWORD)_NORTC_YEAR << 25 | (DWORD)_NORTC_MON << 21 | (DWORD)_NORTC_MDAY << 16)
#else
#define GET_FATTIME()   get_fattime()
#endif


/* File access control feature */
#if _FS_LOCK
#if _FS_READONLY
#error _FS_LOCK must be 0 at read-only configuration
#endif
typedef struct
{
    FATFS *fs;        /* Object ID 1, volume (NULL:blank entry) */
    DWORD clu;        /* Object ID 2, directory (0:root) */
    WORD idx;        /* Object ID 3, directory index */
    WORD ctr;        /* Object open counter, 0:none, 0x01..0xFF:read mode open count, 0x100:write mode */
} FILESEM;
#endif



/* DBCS code ranges and SBCS extend character conversion table */

#if _CODE_PAGE == 932    /* Japanese Shift-JIS */
#define _DF1S    0x81    /* DBC 1st byte range 1 start */
#define _DF1E    0x9F    /* DBC 1st byte range 1 end */
#define _DF2S    0xE0    /* DBC 1st byte range 2 start */
#define _DF2E    0xFC    /* DBC 1st byte range 2 end */
#define _DS1S    0x40    /* DBC 2nd byte range 1 start */
#define _DS1E    0x7E    /* DBC 2nd byte range 1 end */
#define _DS2S    0x80    /* DBC 2nd byte range 2 start */
#define _DS2E    0xFC    /* DBC 2nd byte range 2 end */

#elif _CODE_PAGE == 936    /* Simplified Chinese GBK */
#define _DF1S    0x81
#define _DF1E    0xFE
#define _DS1S    0x40
#define _DS1E    0x7E
#define _DS2S    0x80
#define _DS2E    0xFE

#elif _CODE_PAGE == 949    /* Korean */
#define _DF1S    0x81
#define _DF1E    0xFE
#define _DS1S    0x41
#define _DS1E    0x5A
#define _DS2S    0x61
#define _DS2E    0x7A
#define _DS3S    0x81
#define _DS3E    0xFE

#elif _CODE_PAGE == 950    /* Traditional Chinese Big5 */
#define _DF1S    0x81
#define _DF1E    0xFE
#define _DS1S    0x40
#define _DS1E    0x7E
#define _DS2S    0xA1
#define _DS2E    0xFE

#elif _CODE_PAGE == 437    /* U.S. (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F,0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720    /* Arabic (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x45,0x41,0x84,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x49,0x49,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737    /* Greek (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
        0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xE7,0xE8,0xF1,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 775    /* Baltic (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850    /* Multilingual Latin 1 (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
        0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852    /* Latin 2 (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F,0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0x9F, \
        0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855    /* Cyrillic (OEM) */
#define _DF1S    0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F,0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
        0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
        0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857    /* Turkish (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x98,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
        0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0x59,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 858    /* Multilingual Latin 1 + Euro (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
        0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862    /* Hebrew (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866    /* Russian (OEM) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0x90,0x91,0x92,0x93,0x9d,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 874    /* Thai (OEM, Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1250 /* Central Europe (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xA3,0xB4,0xB5,0xB6,0xB7,0xB8,0xA5,0xAA,0xBB,0xBC,0xBD,0xBC,0xAF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1251 /* Cyrillic (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x82,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x80,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
        0xA0,0xA2,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB2,0xA5,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xA3,0xBD,0xBD,0xAF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF}

#elif _CODE_PAGE == 1252 /* Latin 1 (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0xAd,0x9B,0x8C,0x9D,0xAE,0x9F, \
        0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1253 /* Greek (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xA2,0xB8,0xB9,0xBA, \
        0xE0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xFB,0xBC,0xFD,0xBF,0xFF}

#elif _CODE_PAGE == 1254 /* Turkish (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x9D,0x9E,0x9F, \
        0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1255 /* Hebrew (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1256 /* Arabic (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x8C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0x41,0xE1,0x41,0xE3,0xE4,0xE5,0xE6,0x43,0x45,0x45,0x45,0x45,0xEC,0xED,0x49,0x49,0xF0,0xF1,0xF2,0xF3,0x4F,0xF5,0xF6,0xF7,0xF8,0x55,0xFA,0x55,0x55,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1257 /* Baltic (Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
        0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xBC,0xBD,0xBE,0xAF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1258 /* Vietnam (OEM, Windows) */
#define _DF1S    0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0xAC,0x9D,0x9E,0x9F, \
        0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
        0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xEC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xFE,0x9F}

#elif _CODE_PAGE == 1    /* ASCII (for only non-LFN cfg) */
#if _USE_LFN
#error Cannot use LFN feature without valid code page.
#endif
#define _DF1S    0

#else
#error Unknown code page

#endif


/* Character code support macros */
#define IsUpper(c)    (((c)>='A')&&((c)<='Z'))
#define IsLower(c)    (((c)>='a')&&((c)<='z'))
#define IsDigit(c)    (((c)>='0')&&((c)<='9'))

#if _DF1S        /* Code page is DBCS */

#ifdef _DF2S    /* Two 1st byte areas */
#define IsDBCS1(c)    (((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else            /* One 1st byte area */
#define IsDBCS1(c)    ((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S    /* Three 2nd byte areas */
#define IsDBCS2(c)    (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else            /* Two 2nd byte areas */
#define IsDBCS2(c)    (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else            /* Code page is SBCS */

#define IsDBCS1(c)    0
#define IsDBCS2(c)    0

#endif /* _DF1S */


/* Name status flags */
#define NSFLAG        11        /* Index of name status byte in fn[] */
#define NS_LOSS        0x01    /* Out of 8.3 format */
#define NS_LFN        0x02    /* Force to create LFN entry */
#define NS_LAST        0x04    /* Last segment */
#define NS_BODY        0x08    /* Lower case flag (body) */
#define NS_EXT        0x10    /* Lower case flag (ext) */
#define NS_DOT        0x20    /* Dot entry */


/* FAT sub-type boundaries (Differ from specs but correct for real DOS/Windows) */
#define MIN_FAT16    4086U    /* Minimum number of clusters as FAT16 */
#define    MIN_FAT32    65526U    /* Minimum number of clusters as FAT32 */


/* FatFs refers the members in the FAT structures as byte array instead of
/ structure member because the structure is not binary compatible between
/ different platforms */

#define BS_jmpBoot            0        /* x86 jump instruction (3) */
#define BS_OEMName            3        /* OEM name (8) */
#define BPB_BytsPerSec        11        /* Sector size [byte] (2) */
#define BPB_SecPerClus        13        /* Cluster size [sector] (1) */
#define BPB_RsvdSecCnt        14        /* Size of reserved area [sector] (2) */
#define BPB_NumFATs            16        /* Number of FAT copies (1) */
#define BPB_RootEntCnt        17        /* Number of root directory entries for FAT12/16 (2) */
#define BPB_TotSec16        19        /* Volume size [sector] (2) */
#define BPB_Media            21        /* Media descriptor (1) */
#define BPB_FATSz16            22        /* FAT size [sector] (2) */
#define BPB_SecPerTrk        24        /* Track size [sector] (2) */
#define BPB_NumHeads        26        /* Number of heads (2) */
#define BPB_HiddSec            28        /* Number of special hidden sectors (4) */
#define BPB_TotSec32        32        /* Volume size [sector] (4) */
#define BS_DrvNum            36        /* Physical drive number (2) */
#define BS_BootSig            38        /* Extended boot signature (1) */
#define BS_VolID            39        /* Volume serial number (4) */
#define BS_VolLab            43        /* Volume label (8) */
#define BS_FilSysType        54        /* File system type (1) */
#define BPB_FATSz32            36        /* FAT size [sector] (4) */
#define BPB_ExtFlags        40        /* Extended flags (2) */
#define BPB_FSVer            42        /* File system version (2) */
#define BPB_RootClus        44        /* Root directory first cluster (4) */
#define BPB_FSInfo            48        /* Offset of FSINFO sector (2) */
#define BPB_BkBootSec        50        /* Offset of backup boot sector (2) */
#define BS_DrvNum32            64        /* Physical drive number (2) */
#define BS_BootSig32        66        /* Extended boot signature (1) */
#define BS_VolID32            67        /* Volume serial number (4) */
#define BS_VolLab32            71        /* Volume label (8) */
#define BS_FilSysType32        82        /* File system type (1) */
#define    FSI_LeadSig            0        /* FSI: Leading signature (4) */
#define    FSI_StrucSig        484        /* FSI: Structure signature (4) */
#define    FSI_Free_Count        488        /* FSI: Number of free clusters (4) */
#define    FSI_Nxt_Free        492        /* FSI: Last allocated cluster (4) */
#define MBR_Table            446        /* MBR: Partition table offset (2) */
#define    SZ_PTE                16        /* MBR: Size of a partition table entry */
#define BS_55AA                510        /* Signature word (2) */

#define    DIR_Name            0        /* Short file name (11) */
#define    DIR_Attr            11        /* Attribute (1) */
#define    DIR_NTres            12        /* NT flag (1) */
#define DIR_CrtTimeTenth    13        /* Created time sub-second (1) */
#define    DIR_CrtTime            14        /* Created time (2) */
#define    DIR_CrtDate            16        /* Created date (2) */
#define DIR_LstAccDate        18        /* Last accessed date (2) */
#define    DIR_FstClusHI        20        /* Higher 16-bit of first cluster (2) */
#define    DIR_WrtTime            22        /* Modified time (2) */
#define    DIR_WrtDate            24        /* Modified date (2) */
#define    DIR_FstClusLO        26        /* Lower 16-bit of first cluster (2) */
#define    DIR_FileSize        28        /* File size (4) */
#define    LDIR_Ord            0        /* LFN entry order and LLE flag (1) */
#define    LDIR_Attr            11        /* LFN attribute (1) */
#define    LDIR_Type            12        /* LFN type (1) */
#define    LDIR_Chksum            13        /* Sum of corresponding SFN entry */
#define    LDIR_FstClusLO        26        /* Filled by zero (0) */
#define    SZ_DIR                32        /* Size of a directory entry */
#define    LLE                    0x40    /* Last long entry flag in LDIR_Ord */
#define    DDE                    0xE5    /* Deleted directory entry mark in DIR_Name[0] */
#define    NDDE                0x05    /* Replacement of the character collides with DDE */




/*------------------------------------------------------------*/
/* Module private work area                                   */
/*------------------------------------------------------------*/
/* Remark: Uninitialized variables with static duration are
/  guaranteed zero/null at start-up. If not, either the linker
/  or start-up routine being used is out of ANSI-C standard.
*/

#if _VOLUMES < 1 || _VOLUMES > 9
#error Wrong _VOLUMES setting
#endif
static FATFS *FatFs[_VOLUMES];    /* Pointer to the file system objects (logical drives) */
static WORD Fsid;                /* File system mount ID */

#if _FS_RPATH && _VOLUMES >= 2
static BYTE CurrVol;            /* Current drive */
#endif

#if _FS_LOCK
static FILESEM Files[_FS_LOCK];    /* Open object lock semaphores */
#endif

#if _USE_LFN == 0            /* Non LFN feature */
#define    DEF_NAMEBUF            BYTE sfn[12]
#define INIT_BUF(dobj)        (dobj).fn = sfn
#define    FREE_BUF()
#else
#if _MAX_LFN < 12 || _MAX_LFN > 255
#error Wrong _MAX_LFN setting
#endif
#if _USE_LFN == 1            /* LFN feature with static working buffer */
static WCHAR LfnBuf[_MAX_LFN + 1];
#define    DEF_NAMEBUF            BYTE sfn[12]
#define INIT_BUF(dobj)        { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define    FREE_BUF()
#elif _USE_LFN == 2         /* LFN feature with dynamic working buffer on the stack */
#define    DEF_NAMEBUF            BYTE sfn[12]; WCHAR lbuf[_MAX_LFN+1]
#define INIT_BUF(dobj)        { (dobj).fn = sfn; (dobj).lfn = lbuf; }
#define    FREE_BUF()
#elif _USE_LFN == 3         /* LFN feature with dynamic working buffer on the heap */
#define    DEF_NAMEBUF            BYTE sfn[12]; WCHAR *lfn
#define INIT_BUF(dobj)        { lfn = ff_memalloc((_MAX_LFN + 1) * 2); if (!lfn) LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE); (dobj).lfn = lfn; (dobj).fn = sfn; }
#define    FREE_BUF()            ff_memfree(lfn)
#else
#error Wrong _USE_LFN setting
#endif
#endif

#ifdef _EXCVT
static const BYTE ExCvt[] = _EXCVT;    /* Upper conversion table for extended characters */
#endif






/*--------------------------------------------------------------------------

Module Private Functions

---------------------------------------------------------------------------*/


/*-----------------------------------------------------------------------*/
/* String functions                                                      */
/*-----------------------------------------------------------------------*/

/* Copy memory to memory */
static
void mem_cpy(void *dst, const void *src, UINT cnt)
{
    BYTE *d = (BYTE *)dst;
    const BYTE *s = (const BYTE *)src;
#if _WORD_ACCESS == 1

    while(cnt >= sizeof(int))
    {
        *(int *)d = *(int *)s;
        d += sizeof(int);
        s += sizeof(int);
        cnt -= sizeof(int);
    }

#endif

    while(cnt--)
    {
        *d++ = *s++;
    }
}

/* Fill memory */
static
void mem_set(void *dst, int val, UINT cnt)
{
    BYTE *d = (BYTE *)dst;

    while(cnt--)
    {
        *d++ = (BYTE)val;
    }
}

/* Compare memory to memory */
static
int mem_cmp(const void *dst, const void *src, UINT cnt)
{
    const BYTE *d = (const BYTE *)dst, *s = (const BYTE *)src;
    int r = 0;

    while(cnt-- && (r = *d++ - *s++) == 0);

    return r;
}

/* Check if chr is contained in the string */
static
int chk_chr(const char *str, int chr)
{
    while(*str && *str != chr)
    {
        str++;
    }

    return *str;
}




/*-----------------------------------------------------------------------*/
/* Request/Release grant to access the volume                            */
/*-----------------------------------------------------------------------*/
#if _FS_REENTRANT
static
int lock_fs(
    FATFS *fs        /* File system object */
)
{
    return ff_req_grant(fs->sobj);
}


static
void unlock_fs(
    FATFS *fs,        /* File system object */
    FRESULT res        /* Result code to be returned */
)
{
    if(fs &&
            res != FR_NOT_ENABLED &&
            res != FR_INVALID_DRIVE &&
            res != FR_INVALID_OBJECT &&
            res != FR_TIMEOUT)
    {
        ff_rel_grant(fs->sobj);
    }
}
#endif




/*-----------------------------------------------------------------------*/
/* File lock control functions                                           */
/*-----------------------------------------------------------------------*/
#if _FS_LOCK

static
FRESULT chk_lock(    /* Check if the file can be accessed */
    DIR *dp,        /* Directory object pointing the file to be checked */
    int acc            /* Desired access type (0:Read, 1:Write, 2:Delete/Rename) */
)
{
    UINT i, be;

    /* Search file semaphore table */
    for(i = be = 0; i < _FS_LOCK; i++)
    {
        if(Files[i].fs)       /* Existing entry */
        {
            if(Files[i].fs == dp->fs &&          /* Check if the object matched with an open object */
                    Files[i].clu == dp->sclust &&
                    Files[i].idx == dp->index)
            {
                break;
            }
        }
        else              /* Blank entry */
        {
            be = 1;
        }
    }

    if(i == _FS_LOCK)     /* The object is not opened */
    {
        return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;    /* Is there a blank entry for new object? */
    }

    /* The object has been opened. Reject any open against writing file and all write mode open */
    return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}


static
int enq_lock(void)    /* Check if an entry is available for a new object */
{
    UINT i;

    for(i = 0; i < _FS_LOCK && Files[i].fs; i++);

    return (i == _FS_LOCK) ? 0 : 1;
}


static
UINT inc_lock(    /* Increment object open counter and returns its index (0:Internal error) */
    DIR *dp,    /* Directory object pointing the file to register or increment */
    int acc        /* Desired access (0:Read, 1:Write, 2:Delete/Rename) */
)
{
    UINT i;

    for(i = 0; i < _FS_LOCK; i++)       /* Find the object */
    {
        if(Files[i].fs == dp->fs &&
                Files[i].clu == dp->sclust &&
                Files[i].idx == dp->index)
        {
            break;
        }
    }

    if(i == _FS_LOCK)                   /* Not opened. Register it as new. */
    {
        for(i = 0; i < _FS_LOCK && Files[i].fs; i++);

        if(i == _FS_LOCK)
        {
            return 0;    /* No free entry to register (int err) */
        }

        Files[i].fs = dp->fs;
        Files[i].clu = dp->sclust;
        Files[i].idx = dp->index;
        Files[i].ctr = 0;
    }

    if(acc && Files[i].ctr)
    {
        return 0;    /* Access violation (int err) */
    }

    Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;    /* Set semaphore value */
    return i + 1;
}


static
FRESULT dec_lock(    /* Decrement object open counter */
    UINT i            /* Semaphore index (1..) */
)
{
    WORD n;
    FRESULT res;

    if(--i < _FS_LOCK)       /* Shift index number origin from 0 */
    {
        n = Files[i].ctr;

        if(n == 0x100)
        {
            n = 0;    /* If write mode open, delete the entry */
        }

        if(n)
        {
            n--;    /* Decrement read mode open count */
        }

        Files[i].ctr = n;

        if(!n)
        {
            Files[i].fs = 0;    /* Delete the entry if open count gets zero */
        }

        res = FR_OK;
    }
    else
    {
        res = FR_INT_ERR;            /* Invalid index nunber */
    }

    return res;
}


static
void clear_lock(    /* Clear lock entries of the volume */
    FATFS *fs
)
{
    UINT i;

    for(i = 0; i < _FS_LOCK; i++)
    {
        if(Files[i].fs == fs)
        {
            Files[i].fs = 0;
        }
    }
}
#endif




/*-----------------------------------------------------------------------*/
/* Move/Flush disk access window in the file system object               */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_window(
    FATFS *fs        /* File system object */
)
{
    DWORD wsect;
    UINT nf;
    FRESULT res = FR_OK;

    if(fs->wflag)       /* Write back the sector if it is dirty */
    {
        wsect = fs->winsect;    /* Current sector number */

        if(disk_write(fs->drv, fs->win, wsect, 1) != RES_OK)
        {
            res = FR_DISK_ERR;
        }
        else
        {
            fs->wflag = 0;

            if(wsect - fs->fatbase < fs->fsize)           /* Is it in the FAT area? */
            {
                for(nf = fs->n_fats; nf >= 2; nf--)       /* Reflect the change to all FAT copies */
                {
                    wsect += fs->fsize;
                    disk_write(fs->drv, fs->win, wsect, 1);
                }
            }
        }
    }

    return res;
}
#endif


static
FRESULT move_window(
    FATFS *fs,        /* File system object */
    DWORD sector    /* Sector number to make appearance in the fs->win[] */
)
{
    FRESULT res = FR_OK;

    if(sector != fs->winsect)       /* Window offset changed? */
    {
#if !_FS_READONLY
        res = sync_window(fs);        /* Write-back changes */
#endif

        if(res == FR_OK)               /* Fill sector window with new data */
        {
            if(disk_read(fs->drv, fs->win, sector, 1) != RES_OK)
            {
                sector = 0xFFFFFFFF;    /* Invalidate window if data is not reliable */
                res = FR_DISK_ERR;
            }

            fs->winsect = sector;
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Synchronize file system and strage device                             */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT sync_fs(    /* FR_OK: successful, FR_DISK_ERR: failed */
    FATFS *fs        /* File system object */
)
{
    FRESULT res;
    res = sync_window(fs);

    if(res == FR_OK)
    {
        /* Update FSINFO sector if needed */
        if(fs->fs_type == FS_FAT32 && fs->fsi_flag == 1)
        {
            /* Create FSINFO structure */
            mem_set(fs->win, 0, SS(fs));
            ST_WORD(fs->win + BS_55AA, 0xAA55);
            ST_DWORD(fs->win + FSI_LeadSig, 0x41615252);
            ST_DWORD(fs->win + FSI_StrucSig, 0x61417272);
            ST_DWORD(fs->win + FSI_Free_Count, fs->free_clust);
            ST_DWORD(fs->win + FSI_Nxt_Free, fs->last_clust);
            /* Write it into the FSINFO sector */
            fs->winsect = fs->volbase + 1;
            disk_write(fs->drv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }

        /* Make sure that no pending write process in the physical drive */
        if(disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK)
        {
            res = FR_DISK_ERR;
        }
    }

    return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Get sector# from cluster#                                             */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

DWORD clust2sect(    /* !=0: Sector number, 0: Failed - invalid cluster# */
    FATFS *fs,        /* File system object */
    DWORD clst        /* Cluster# to be converted */
)
{
    clst -= 2;

    if(clst >= fs->n_fatent - 2)
    {
        return 0;    /* Invalid cluster# */
    }

    return clst * fs->csize + fs->database;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Read value of a FAT entry                                */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

DWORD get_fat(    /* 0xFFFFFFFF:Disk error, 1:Internal error, 2..0x0FFFFFFF:Cluster status */
    FATFS *fs,    /* File system object */
    DWORD clst    /* FAT item index (cluster#) to get the value */
)
{
    UINT wc, bc;
    BYTE *p;
    DWORD val;

    if(clst < 2 || clst >= fs->n_fatent)       /* Check range */
    {
        val = 1;    /* Internal error */
    }
    else
    {
        val = 0xFFFFFFFF;    /* Default value falls on disk error */

        switch(fs->fs_type)
        {
            case FS_FAT12:
                bc = (UINT)clst;
                bc += bc / 2;

                if(move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK)
                {
                    break;
                }

                wc = fs->win[bc++ % SS(fs)];

                if(move_window(fs, fs->fatbase + (bc / SS(fs))) != FR_OK)
                {
                    break;
                }

                wc |= fs->win[bc % SS(fs)] << 8;
                val = clst & 1 ? wc >> 4 : (wc & 0xFFF);
                break;

            case FS_FAT16:
                if(move_window(fs, fs->fatbase + (clst / (SS(fs) / 2))) != FR_OK)
                {
                    break;
                }

                p = &fs->win[clst * 2 % SS(fs)];
                val = LD_WORD(p);
                break;

            case FS_FAT32:
                if(move_window(fs, fs->fatbase + (clst / (SS(fs) / 4))) != FR_OK)
                {
                    break;
                }

                p = &fs->win[clst * 4 % SS(fs)];
                val = LD_DWORD(p) & 0x0FFFFFFF;
                break;

            default:
                val = 1;    /* Internal error */
        }
    }

    return val;
}




/*-----------------------------------------------------------------------*/
/* FAT access - Change value of a FAT entry                              */
/*-----------------------------------------------------------------------*/
/* Hidden API for hacks and disk tools */

#if !_FS_READONLY
FRESULT put_fat(
    FATFS *fs,    /* File system object */
    DWORD clst,    /* FAT item index (cluster#) to be set */
    DWORD val    /* New value to mark the cluster */
)
{
    UINT bc;
    BYTE *p;
    FRESULT res;

    if(clst < 2 || clst >= fs->n_fatent)       /* Check range */
    {
        res = FR_INT_ERR;
    }
    else
    {
        switch(fs->fs_type)
        {
            case FS_FAT12:
                bc = (UINT)clst;
                bc += bc / 2;
                res = move_window(fs, fs->fatbase + (bc / SS(fs)));

                if(res != FR_OK)
                {
                    break;
                }

                p = &fs->win[bc++ % SS(fs)];
                *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
                fs->wflag = 1;
                res = move_window(fs, fs->fatbase + (bc / SS(fs)));

                if(res != FR_OK)
                {
                    break;
                }

                p = &fs->win[bc % SS(fs)];
                *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
                fs->wflag = 1;
                break;

            case FS_FAT16:
                res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));

                if(res != FR_OK)
                {
                    break;
                }

                p = &fs->win[clst * 2 % SS(fs)];
                ST_WORD(p, (WORD)val);
                fs->wflag = 1;
                break;

            case FS_FAT32:
                res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));

                if(res != FR_OK)
                {
                    break;
                }

                p = &fs->win[clst * 4 % SS(fs)];
                val |= LD_DWORD(p) & 0xF0000000;
                ST_DWORD(p, val);
                fs->wflag = 1;
                break;

            default:
                res = FR_INT_ERR;
        }
    }

    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Remove a cluster chain                                 */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT remove_chain(
    FATFS *fs,            /* File system object */
    DWORD clst            /* Cluster# to remove a chain from */
)
{
    FRESULT res;
    DWORD nxt;
#if _USE_TRIM
    DWORD scl = clst, ecl = clst, rt[2];
#endif

    if(clst < 2 || clst >= fs->n_fatent)       /* Check range */
    {
        res = FR_INT_ERR;
    }
    else
    {
        res = FR_OK;

        while(clst < fs->n_fatent)               /* Not a last link? */
        {
            nxt = get_fat(fs, clst);            /* Get cluster status */

            if(nxt == 0)
            {
                break;    /* Empty cluster? */
            }

            if(nxt == 1)
            {
                res = FR_INT_ERR;    /* Internal error? */
                break;
            }

            if(nxt == 0xFFFFFFFF)
            {
                res = FR_DISK_ERR;    /* Disk error? */
                break;
            }

            res = put_fat(fs, clst, 0);            /* Mark the cluster "empty" */

            if(res != FR_OK)
            {
                break;
            }

            if(fs->free_clust != 0xFFFFFFFF)       /* Update FSINFO */
            {
                fs->free_clust++;
                fs->fsi_flag |= 1;
            }

#if _USE_TRIM

            if(ecl + 1 == nxt)       /* Is next cluster contiguous? */
            {
                ecl = nxt;
            }
            else                  /* End of contiguous clusters */
            {
                rt[0] = clust2sect(fs, scl);                    /* Start sector */
                rt[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
                disk_ioctl(fs->drv, CTRL_TRIM, rt);                /* Erase the block */
                scl = ecl = nxt;
            }

#endif
            clst = nxt;    /* Next cluster */
        }
    }

    return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* FAT handling - Stretch or Create a cluster chain                      */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
DWORD create_chain(    /* 0:No free cluster, 1:Internal error, 0xFFFFFFFF:Disk error, >=2:New cluster# */
    FATFS *fs,            /* File system object */
    DWORD clst            /* Cluster# to stretch. 0 means create a new chain. */
)
{
    DWORD cs, ncl, scl;
    FRESULT res;

    if(clst == 0)           /* Create a new chain */
    {
        scl = fs->last_clust;            /* Get suggested start point */

        if(!scl || scl >= fs->n_fatent)
        {
            scl = 1;
        }
    }
    else                      /* Stretch the current chain */
    {
        cs = get_fat(fs, clst);            /* Check the cluster status */

        if(cs < 2)
        {
            return 1;    /* Invalid value */
        }

        if(cs == 0xFFFFFFFF)
        {
            return cs;    /* A disk error occurred */
        }

        if(cs < fs->n_fatent)
        {
            return cs;    /* It is already followed by next cluster */
        }

        scl = clst;
    }

    ncl = scl;                /* Start cluster */

    for(;;)
    {
        ncl++;                            /* Next cluster */

        if(ncl >= fs->n_fatent)           /* Check wrap around */
        {
            ncl = 2;

            if(ncl > scl)
            {
                return 0;    /* No free cluster */
            }
        }

        cs = get_fat(fs, ncl);            /* Get the cluster status */

        if(cs == 0)
        {
            break;    /* Found a free cluster */
        }

        if(cs == 0xFFFFFFFF || cs == 1) /* An error occurred */
        {
            return cs;
        }

        if(ncl == scl)
        {
            return 0;    /* No free cluster */
        }
    }

    res = put_fat(fs, ncl, 0x0FFFFFFF);    /* Mark the new cluster "last link" */

    if(res == FR_OK && clst != 0)
    {
        res = put_fat(fs, clst, ncl);    /* Link it to the previous one if needed */
    }

    if(res == FR_OK)
    {
        fs->last_clust = ncl;            /* Update FSINFO */

        if(fs->free_clust != 0xFFFFFFFF)
        {
            fs->free_clust--;
            fs->fsi_flag |= 1;
        }
    }
    else
    {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
    }

    return ncl;        /* Return new cluster number or error code */
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* FAT handling - Convert offset into cluster with link map table        */
/*-----------------------------------------------------------------------*/

#if _USE_FASTSEEK
static
DWORD clmt_clust(    /* <2:Error, >=2:Cluster number */
    FIL *fp,        /* Pointer to the file object */
    DWORD ofs        /* File offset to be converted to cluster# */
)
{
    DWORD cl, ncl, *tbl;
    tbl = fp->cltbl + 1;    /* Top of CLMT */
    cl = ofs / SS(fp->fs) / fp->fs->csize;    /* Cluster order from top of the file */

    for(;;)
    {
        ncl = *tbl++;            /* Number of cluters in the fragment */

        if(!ncl)
        {
            return 0;    /* End of table? (error) */
        }

        if(cl < ncl)
        {
            break;    /* In this fragment? */
        }

        cl -= ncl;
        tbl++;        /* Next fragment */
    }

    return cl + *tbl;    /* Return the cluster number */
}
#endif    /* _USE_FASTSEEK */




/*-----------------------------------------------------------------------*/
/* Directory handling - Set directory index                              */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_sdi(
    DIR *dp,        /* Pointer to directory object */
    UINT idx        /* Index of directory table */
)
{
    DWORD clst, sect;
    UINT ic;
    dp->index = (WORD)idx;    /* Current index */
    clst = dp->sclust;        /* Table start cluster (0:root) */

    if(clst == 1 || clst >= dp->fs->n_fatent)     /* Check start cluster range */
    {
        return FR_INT_ERR;
    }

    if(!clst && dp->fs->fs_type == FS_FAT32)     /* Replace cluster# 0 with root cluster# if in FAT32 */
    {
        clst = dp->fs->dirbase;
    }

    if(clst == 0)       /* Static table (root-directory in FAT12/16) */
    {
        if(idx >= dp->fs->n_rootdir)     /* Is index out of range? */
        {
            return FR_INT_ERR;
        }

        sect = dp->fs->dirbase;
    }
    else                  /* Dynamic table (root-directory in FAT32 or sub-directory) */
    {
        ic = SS(dp->fs) / SZ_DIR * dp->fs->csize;    /* Entries per cluster */

        while(idx >= ic)       /* Follow cluster chain */
        {
            clst = get_fat(dp->fs, clst);                /* Get next cluster */

            if(clst == 0xFFFFFFFF)
            {
                return FR_DISK_ERR;    /* Disk error */
            }

            if(clst < 2 || clst >= dp->fs->n_fatent)     /* Reached to end of table or internal error */
            {
                return FR_INT_ERR;
            }

            idx -= ic;
        }

        sect = clust2sect(dp->fs, clst);
    }

    dp->clust = clst;    /* Current cluster# */

    if(!sect)
    {
        return FR_INT_ERR;
    }

    dp->sect = sect + idx / (SS(dp->fs) / SZ_DIR);                    /* Sector# of the directory entry */
    dp->dir = dp->fs->win + (idx % (SS(dp->fs) / SZ_DIR)) * SZ_DIR;    /* Ptr to the entry in the sector */
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Move directory table index next                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_next(    /* FR_OK:Succeeded, FR_NO_FILE:End of table, FR_DENIED:Could not stretch */
    DIR *dp,        /* Pointer to the directory object */
    int stretch        /* 0: Do not stretch table, 1: Stretch table if needed */
)
{
    DWORD clst;
    UINT i;
    i = dp->index + 1;

    if(!(i & 0xFFFF) || !dp->sect)     /* Report EOT when index has reached 65535 */
    {
        return FR_NO_FILE;
    }

    if(!(i % (SS(dp->fs) / SZ_DIR)))       /* Sector changed? */
    {
        dp->sect++;                    /* Next sector */

        if(!dp->clust)           /* Static table */
        {
            if(i >= dp->fs->n_rootdir)     /* Report EOT if it reached end of static table */
            {
                return FR_NO_FILE;
            }
        }
        else                      /* Dynamic table */
        {
            if(((i / (SS(dp->fs) / SZ_DIR)) & (dp->fs->csize - 1)) == 0)       /* Cluster changed? */
            {
                clst = get_fat(dp->fs, dp->clust);                /* Get next cluster */

                if(clst <= 1)
                {
                    return FR_INT_ERR;
                }

                if(clst == 0xFFFFFFFF)
                {
                    return FR_DISK_ERR;
                }

                if(clst >= dp->fs->n_fatent)                       /* If it reached end of dynamic table, */
                {
#if !_FS_READONLY
                    UINT c;

                    if(!stretch)
                    {
                        return FR_NO_FILE;    /* If do not stretch, report EOT */
                    }

                    clst = create_chain(dp->fs, dp->clust);        /* Stretch cluster chain */

                    if(clst == 0)
                    {
                        return FR_DENIED;    /* No free cluster */
                    }

                    if(clst == 1)
                    {
                        return FR_INT_ERR;
                    }

                    if(clst == 0xFFFFFFFF)
                    {
                        return FR_DISK_ERR;
                    }

                    /* Clean-up stretched table */
                    if(sync_window(dp->fs))
                    {
                        return FR_DISK_ERR;    /* Flush disk access window */
                    }

                    mem_set(dp->fs->win, 0, SS(dp->fs));        /* Clear window buffer */
                    dp->fs->winsect = clust2sect(dp->fs, clst);    /* Cluster start sector */

                    for(c = 0; c < dp->fs->csize; c++)           /* Fill the new cluster with 0 */
                    {
                        dp->fs->wflag = 1;

                        if(sync_window(dp->fs))
                        {
                            return FR_DISK_ERR;
                        }

                        dp->fs->winsect++;
                    }

                    dp->fs->winsect -= c;                        /* Rewind window offset */
#else

                    if(!stretch)
                    {
                        return FR_NO_FILE;    /* If do not stretch, report EOT (this is to suppress warning) */
                    }

                    return FR_NO_FILE;                            /* Report EOT */
#endif
                }

                dp->clust = clst;                /* Initialize data for new cluster */
                dp->sect = clust2sect(dp->fs, clst);
            }
        }
    }

    dp->index = (WORD)i;    /* Current index */
    dp->dir = dp->fs->win + (i % (SS(dp->fs) / SZ_DIR)) * SZ_DIR;    /* Current entry in the window */
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Directory handling - Reserve directory entry                          */
/*-----------------------------------------------------------------------*/

#if !_FS_READONLY
static
FRESULT dir_alloc(
    DIR *dp,    /* Pointer to the directory object */
    UINT nent    /* Number of contiguous entries to allocate (1-21) */
)
{
    FRESULT res;
    UINT n;
    res = dir_sdi(dp, 0);

    if(res == FR_OK)
    {
        n = 0;

        do
        {
            res = move_window(dp->fs, dp->sect);

            if(res != FR_OK)
            {
                break;
            }

            if(dp->dir[0] == DDE || dp->dir[0] == 0)       /* Is it a free entry? */
            {
                if(++n == nent)
                {
                    break;    /* A block of contiguous free entries is found */
                }
            }
            else
            {
                n = 0;                    /* Not a blank entry. Restart to search */
            }

            res = dir_next(dp, 1);        /* Next entry with table stretch enabled */
        }
        while(res == FR_OK);
    }

    if(res == FR_NO_FILE)
    {
        res = FR_DENIED;    /* No directory entry to allocate */
    }

    return res;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Load/Store start cluster number                  */
/*-----------------------------------------------------------------------*/

static
DWORD ld_clust(
    FATFS *fs,    /* Pointer to the fs object */
    BYTE *dir    /* Pointer to the directory entry */
)
{
    DWORD cl;
    cl = LD_WORD(dir + DIR_FstClusLO);

    if(fs->fs_type == FS_FAT32)
    {
        cl |= (DWORD)LD_WORD(dir + DIR_FstClusHI) << 16;
    }

    return cl;
}


#if !_FS_READONLY
static
void st_clust(
    BYTE *dir,    /* Pointer to the directory entry */
    DWORD cl    /* Value to be set */
)
{
    ST_WORD(dir + DIR_FstClusLO, cl);
    ST_WORD(dir + DIR_FstClusHI, cl >> 16);
}
#endif




/*-----------------------------------------------------------------------*/
/* LFN handling - Test/Pick/Fit an LFN segment from/to directory entry   */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
const BYTE LfnOfs[] = { 1, 3, 5, 7, 9, 14, 16, 18, 20, 22, 24, 28, 30 }; /* Offset of LFN characters in the directory entry */


static
int cmp_lfn(            /* 1:Matched, 0:Not matched */
    WCHAR *lfnbuf,        /* Pointer to the LFN to be compared */
    BYTE *dir            /* Pointer to the directory entry containing a part of LFN */
)
{
    UINT i, s;
    WCHAR wc, uc;
    i = ((dir[LDIR_Ord] & ~LLE) - 1) * 13;    /* Get offset in the LFN buffer */
    s = 0;
    wc = 1;

    do
    {
        uc = LD_WORD(dir + LfnOfs[s]);    /* Pick an LFN character from the entry */

        if(wc)       /* Last character has not been processed */
        {
            wc = ff_wtoupper(uc);        /* Convert it to upper case */

            if(i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]))     /* Compare it */
            {
                return 0;    /* Not matched */
            }
        }
        else
        {
            if(uc != 0xFFFF)
            {
                return 0;    /* Check filler */
            }
        }
    }
    while(++s < 13);                   /* Repeat until all characters in the entry are checked */

    if((dir[LDIR_Ord] & LLE) && wc && lfnbuf[i])     /* Last segment matched but different length */
    {
        return 0;
    }

    return 1;                        /* The part of LFN matched */
}



static
int pick_lfn(            /* 1:Succeeded, 0:Buffer overflow */
    WCHAR *lfnbuf,        /* Pointer to the Unicode-LFN buffer */
    BYTE *dir            /* Pointer to the directory entry */
)
{
    UINT i, s;
    WCHAR wc, uc;
    i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;    /* Offset in the LFN buffer */
    s = 0;
    wc = 1;

    do
    {
        uc = LD_WORD(dir + LfnOfs[s]);        /* Pick an LFN character from the entry */

        if(wc)       /* Last character has not been processed */
        {
            if(i >= _MAX_LFN)
            {
                return 0;    /* Buffer overflow? */
            }

            lfnbuf[i++] = wc = uc;            /* Store it */
        }
        else
        {
            if(uc != 0xFFFF)
            {
                return 0;    /* Check filler */
            }
        }
    }
    while(++s < 13);                           /* Read all character in the entry */

    if(dir[LDIR_Ord] & LLE)                   /* Put terminator if it is the last LFN part */
    {
        if(i >= _MAX_LFN)
        {
            return 0;    /* Buffer overflow? */
        }

        lfnbuf[i] = 0;
    }

    return 1;
}


#if !_FS_READONLY
static
void fit_lfn(
    const WCHAR *lfnbuf,    /* Pointer to the LFN buffer */
    BYTE *dir,                /* Pointer to the directory entry */
    BYTE ord,                /* LFN order (1-20) */
    BYTE sum                /* SFN sum */
)
{
    UINT i, s;
    WCHAR wc;
    dir[LDIR_Chksum] = sum;            /* Set check sum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    ST_WORD(dir + LDIR_FstClusLO, 0);
    i = (ord - 1) * 13;                /* Get offset in the LFN buffer */
    s = wc = 0;

    do
    {
        if(wc != 0xFFFF)
        {
            wc = lfnbuf[i++];    /* Get an effective character */
        }

        ST_WORD(dir + LfnOfs[s], wc);    /* Put it */

        if(!wc)
        {
            wc = 0xFFFF;    /* Padding characters following last character */
        }
    }
    while(++s < 13);

    if(wc == 0xFFFF || !lfnbuf[i])
    {
        ord |= LLE;    /* Bottom LFN part is the start of LFN sequence */
    }

    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}

#endif
#endif




/*-----------------------------------------------------------------------*/
/* Create numbered name                                                  */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
void gen_numname(
    BYTE *dst,            /* Pointer to the buffer to store numbered SFN */
    const BYTE *src,    /* Pointer to SFN */
    const WCHAR *lfn,    /* Pointer to LFN */
    UINT seq            /* Sequence number */
)
{
    BYTE ns[8], c;
    UINT i, j;
    mem_cpy(dst, src, 11);

    if(seq > 5)       /* On many collisions, generate a hash number instead of sequential number */
    {
        WCHAR wc;
        DWORD sr = seq;

        while(*lfn)       /* Create a CRC */
        {
            wc = *lfn++;

            for(i = 0; i < 16; i++)
            {
                sr = (sr << 1) + (wc & 1);
                wc >>= 1;

                if(sr & 0x10000)
                {
                    sr ^= 0x11021;
                }
            }
        }

        seq = (UINT)sr;
    }

    /* itoa (hexdecimal) */
    i = 7;

    do
    {
        c = (seq % 16) + '0';

        if(c > '9')
        {
            c += 7;
        }

        ns[i--] = c;
        seq /= 16;
    }
    while(seq);

    ns[i] = '~';

    /* Append the number */
    for(j = 0; j < i && dst[j] != ' '; j++)
    {
        if(IsDBCS1(dst[j]))
        {
            if(j == i - 1)
            {
                break;
            }

            j++;
        }
    }

    do
    {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    }
    while(j < 8);
}
#endif




/*-----------------------------------------------------------------------*/
/* Calculate sum of an SFN                                               */
/*-----------------------------------------------------------------------*/
#if _USE_LFN
static
BYTE sum_sfn(
    const BYTE *dir        /* Pointer to the SFN entry */
)
{
    BYTE sum = 0;
    UINT n = 11;

    do
    {
        sum = (sum >> 1) + (sum << 7) + *dir++;
    }
    while(--n);

    return sum;
}
#endif




/*-----------------------------------------------------------------------*/
/* Directory handling - Find an object in the directory                  */
/*-----------------------------------------------------------------------*/

static
FRESULT dir_find(
    DIR *dp            /* Pointer to the directory object linked to the file name */
)
{
    FRESULT res;
    BYTE c, *dir;
#if _USE_LFN
    BYTE a, ord, sum;
#endif
    res = dir_sdi(dp, 0);            /* Rewind directory object */

    if(res != FR_OK)
    {
        return res;
    }

#if _USE_LFN
    ord = sum = 0xFF;
    dp->lfn_idx = 0xFFFF;    /* Reset LFN sequence */
#endif

    do
    {
        res = move_window(dp->fs, dp->sect);

        if(res != FR_OK)
        {
            break;
        }

        dir = dp->dir;                    /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];

        if(c == 0)
        {
            res = FR_NO_FILE;    /* Reached to end of table */
            break;
        }

#if _USE_LFN    /* LFN configuration */
        a = dir[DIR_Attr] & AM_MASK;

        if(c == DDE || ((a & AM_VOL) && a != AM_LFN))       /* An entry without valid data */
        {
            ord = 0xFF;
            dp->lfn_idx = 0xFFFF;    /* Reset LFN sequence */
        }
        else
        {
            if(a == AM_LFN)               /* An LFN entry is found */
            {
                if(dp->lfn)
                {
                    if(c & LLE)           /* Is it start of LFN sequence? */
                    {
                        sum = dir[LDIR_Chksum];
                        c &= ~LLE;
                        ord = c;    /* LFN start order */
                        dp->lfn_idx = dp->index;    /* Start index of LFN */
                    }

                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
                }
            }
            else                      /* An SFN entry is found */
            {
                if(!ord && sum == sum_sfn(dir))
                {
                    break;    /* LFN matched? */
                }

                if(!(dp->fn[NSFLAG] & NS_LOSS) && !mem_cmp(dir, dp->fn, 11))
                {
                    break;    /* SFN matched? */
                }

                ord = 0xFF;
                dp->lfn_idx = 0xFFFF;    /* Reset LFN sequence */
            }
        }

#else        /* Non LFN configuration */

        if(!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dp->fn, 11))  /* Is it a valid entry? */
        {
            break;
        }

#endif
        res = dir_next(dp, 0);        /* Next entry */
    }
    while(res == FR_OK);

    return res;
}




/*-----------------------------------------------------------------------*/
/* Read an object from the directory                                     */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2
static
FRESULT dir_read(
    DIR *dp,        /* Pointer to the directory object */
    int vol            /* Filtered by 0:file/directory or 1:volume label */
)
{
    FRESULT res;
    BYTE a, c, *dir;
#if _USE_LFN
    BYTE ord = 0xFF, sum = 0xFF;
#endif
    res = FR_NO_FILE;

    while(dp->sect)
    {
        res = move_window(dp->fs, dp->sect);

        if(res != FR_OK)
        {
            break;
        }

        dir = dp->dir;                    /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];

        if(c == 0)
        {
            res = FR_NO_FILE;    /* Reached to end of table */
            break;
        }

        a = dir[DIR_Attr] & AM_MASK;
#if _USE_LFN    /* LFN configuration */

        if(c == DDE || (!_FS_RPATH && c == '.') || (int)((a & ~AM_ARC) == AM_VOL) != vol)       /* An entry without valid data */
        {
            ord = 0xFF;
        }
        else
        {
            if(a == AM_LFN)               /* An LFN entry is found */
            {
                if(c & LLE)               /* Is it start of LFN sequence? */
                {
                    sum = dir[LDIR_Chksum];
                    c &= ~LLE;
                    ord = c;
                    dp->lfn_idx = dp->index;
                }

                /* Check LFN validity and capture it */
                ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
            }
            else                      /* An SFN entry is found */
            {
                if(ord || sum != sum_sfn(dir))     /* Is there a valid LFN? */
                {
                    dp->lfn_idx = 0xFFFF;    /* It has no LFN. */
                }

                break;
            }
        }

#else        /* Non LFN configuration */

        if(c != DDE && (_FS_RPATH || c != '.') && a != AM_LFN && (int)((a & ~AM_ARC) == AM_VOL) == vol)     /* Is it a valid entry? */
        {
            break;
        }

#endif
        res = dir_next(dp, 0);                /* Next entry */

        if(res != FR_OK)
        {
            break;
        }
    }

    if(res != FR_OK)
    {
        dp->sect = 0;
    }

    return res;
}
#endif    /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */




/*-----------------------------------------------------------------------*/
/* Register an object to the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY
static
FRESULT dir_register(    /* FR_OK:Successful, FR_DENIED:No free entry or too many SFN collision, FR_DISK_ERR:Disk error */
    DIR *dp                /* Target directory with object name to be created */
)
{
    FRESULT res;
#if _USE_LFN    /* LFN configuration */
    UINT n, nent;
    BYTE sn[12], *fn, sum;
    WCHAR *lfn;
    fn = dp->fn;
    lfn = dp->lfn;
    mem_cpy(sn, fn, 12);

    if(_FS_RPATH && (sn[NSFLAG] & NS_DOT))         /* Cannot create dot entry */
    {
        return FR_INVALID_NAME;
    }

    if(sn[NSFLAG] & NS_LOSS)               /* When LFN is out of 8.3 format, generate a numbered name */
    {
        fn[NSFLAG] = 0;
        dp->lfn = 0;            /* Find only SFN */

        for(n = 1; n < 100; n++)
        {
            gen_numname(fn, sn, lfn, n);    /* Generate a numbered name */
            res = dir_find(dp);                /* Check if the name collides with existing SFN */

            if(res != FR_OK)
            {
                break;
            }
        }

        if(n == 100)
        {
            return FR_DENIED;    /* Abort if too many collisions */
        }

        if(res != FR_NO_FILE)
        {
            return res;    /* Abort if the result is other than 'not collided' */
        }

        fn[NSFLAG] = sn[NSFLAG];
        dp->lfn = lfn;
    }

    if(sn[NSFLAG] & NS_LFN)               /* When LFN is to be created, allocate entries for an SFN + LFNs. */
    {
        for(n = 0; lfn[n]; n++);

        nent = (n + 25) / 13;
    }
    else                          /* Otherwise allocate an entry for an SFN  */
    {
        nent = 1;
    }

    res = dir_alloc(dp, nent);        /* Allocate entries */

    if(res == FR_OK && --nent)       /* Set LFN entry if needed */
    {
        res = dir_sdi(dp, dp->index - nent);

        if(res == FR_OK)
        {
            sum = sum_sfn(dp->fn);    /* Sum value of the SFN tied to the LFN */

            do                      /* Store LFN entries in bottom first */
            {
                res = move_window(dp->fs, dp->sect);

                if(res != FR_OK)
                {
                    break;
                }

                fit_lfn(dp->lfn, dp->dir, (BYTE)nent, sum);
                dp->fs->wflag = 1;
                res = dir_next(dp, 0);    /* Next entry */
            }
            while(res == FR_OK && --nent);
        }
    }

#else    /* Non LFN configuration */
    res = dir_alloc(dp, 1);        /* Allocate an entry for SFN */
#endif

    if(res == FR_OK)                   /* Set SFN entry */
    {
        res = move_window(dp->fs, dp->sect);

        if(res == FR_OK)
        {
            mem_set(dp->dir, 0, SZ_DIR);    /* Clean the entry */
            mem_cpy(dp->dir, dp->fn, 11);    /* Put SFN */
#if _USE_LFN
            dp->dir[DIR_NTres] = dp->fn[NSFLAG] & (NS_BODY | NS_EXT);    /* Put NT flag */
#endif
            dp->fs->wflag = 1;
        }
    }

    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Remove an object from the directory                                   */
/*-----------------------------------------------------------------------*/
#if !_FS_READONLY && !_FS_MINIMIZE
static
FRESULT dir_remove(    /* FR_OK: Successful, FR_DISK_ERR: A disk error */
    DIR *dp                /* Directory object pointing the entry to be removed */
)
{
    FRESULT res;
#if _USE_LFN    /* LFN configuration */
    UINT i;
    i = dp->index;    /* SFN index */
    res = dir_sdi(dp, (dp->lfn_idx == 0xFFFF) ? i : dp->lfn_idx);    /* Goto the SFN or top of the LFN entries */

    if(res == FR_OK)
    {
        do
        {
            res = move_window(dp->fs, dp->sect);

            if(res != FR_OK)
            {
                break;
            }

            mem_set(dp->dir, 0, SZ_DIR);    /* Clear and mark the entry "deleted" */
            *dp->dir = DDE;
            dp->fs->wflag = 1;

            if(dp->index >= i)
            {
                break;    /* When reached SFN, all entries of the object has been deleted. */
            }

            res = dir_next(dp, 0);        /* Next entry */
        }
        while(res == FR_OK);

        if(res == FR_NO_FILE)
        {
            res = FR_INT_ERR;
        }
    }

#else            /* Non LFN configuration */
    res = dir_sdi(dp, dp->index);

    if(res == FR_OK)
    {
        res = move_window(dp->fs, dp->sect);

        if(res == FR_OK)
        {
            mem_set(dp->dir, 0, SZ_DIR);    /* Clear and mark the entry "deleted" */
            *dp->dir = DDE;
            dp->fs->wflag = 1;
        }
    }

#endif
    return res;
}
#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Get file information from directory entry                             */
/*-----------------------------------------------------------------------*/
#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2
static
void get_fileinfo(        /* No return code */
    DIR *dp,            /* Pointer to the directory object */
    FILINFO *fno         /* Pointer to the file information to be filled */
)
{
    UINT i;
    TCHAR *p, c;
    p = fno->fname;

    if(dp->sect)           /* Get SFN */
    {
        BYTE *dir = dp->dir;
        i = 0;

        while(i < 11)           /* Copy name body and extension */
        {
            c = (TCHAR)dir[i++];

            if(c == ' ')
            {
                continue;    /* Skip padding spaces */
            }

            if(c == NDDE)
            {
                c = (TCHAR)DDE;    /* Restore replaced DDE character */
            }

            if(i == 9)
            {
                *p++ = '.';    /* Insert a . if extension is exist */
            }

#if _USE_LFN

            if(IsUpper(c) && (dir[DIR_NTres] & (i >= 9 ? NS_EXT : NS_BODY)))
            {
                c += 0x20;    /* To lower */
            }

#if _LFN_UNICODE

            if(IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dir[i]))
            {
                c = c << 8 | dir[i++];
            }

            c = ff_convert(c, 1);    /* OEM -> Unicode */

            if(!c)
            {
                c = '?';
            }

#endif
#endif
            *p++ = c;
        }

        fno->fattrib = dir[DIR_Attr];                /* Attribute */
        fno->fsize = LD_DWORD(dir + DIR_FileSize);    /* Size */
        fno->fdate = LD_WORD(dir + DIR_WrtDate);        /* Date */
        fno->ftime = LD_WORD(dir + DIR_WrtTime);        /* Time */
    }

    *p = 0;        /* Terminate SFN string by a \0 */
#if _USE_LFN

    if(fno->lfname)
    {
        WCHAR w, *lfn;
        i = 0;
        p = fno->lfname;

        if(dp->sect && fno->lfsize && dp->lfn_idx != 0xFFFF)       /* Get LFN if available */
        {
            lfn = dp->lfn;

            while((w = *lfn++) != 0)           /* Get an LFN character */
            {
#if !_LFN_UNICODE
                w = ff_convert(w, 0);        /* Unicode -> OEM */

                if(!w)
                {
                    i = 0;    /* No LFN if it could not be converted */
                    break;
                }

                if(_DF1S && w >= 0x100)     /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
                {
                    p[i++] = (TCHAR)(w >> 8);
                }

#endif

                if(i >= fno->lfsize - 1)
                {
                    i = 0;    /* No LFN if buffer overflow */
                    break;
                }

                p[i++] = (TCHAR)w;
            }
        }

        p[i] = 0;    /* Terminate LFN string by a \0 */
    }

#endif
}
#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2*/




/*-----------------------------------------------------------------------*/
/* Pick a segment and create the object name in directory form           */
/*-----------------------------------------------------------------------*/

static
FRESULT create_name(
    DIR *dp,            /* Pointer to the directory object */
    const TCHAR **path    /* Pointer to pointer to the segment in the path string */
)
{
#if _USE_LFN    /* LFN configuration */
    BYTE b, cf;
    WCHAR w, *lfn;
    UINT i, ni, si, di;
    const TCHAR *p;

    /* Create LFN in Unicode */
    for(p = *path; *p == '/' || *p == '\\'; p++);     /* Strip duplicated separator */

    lfn = dp->lfn;
    si = di = 0;

    for(;;)
    {
        w = p[si++];                    /* Get a character */

        if(w < ' ' || w == '/' || w == '\\')
        {
            break;    /* Break on end of segment */
        }

        if(di >= _MAX_LFN)                 /* Reject too long name */
        {
            return FR_INVALID_NAME;
        }

#if !_LFN_UNICODE
        w &= 0xFF;

        if(IsDBCS1(w))                   /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
        {
            b = (BYTE)p[si++];            /* Get 2nd byte */

            if(!IsDBCS2(b))
            {
                return FR_INVALID_NAME;    /* Reject invalid sequence */
            }

            w = (w << 8) + b;            /* Create a DBC */
        }

        w = ff_convert(w, 1);            /* Convert ANSI/OEM to Unicode */

        if(!w)
        {
            return FR_INVALID_NAME;    /* Reject invalid code */
        }

#endif

        if(w < 0x80 && chk_chr("\"*:<>\?|\x7F", w))  /* Reject illegal characters for LFN */
        {
            return FR_INVALID_NAME;
        }

        lfn[di++] = w;                    /* Store the Unicode character */
    }

    *path = &p[si];                        /* Return pointer to the next segment */
    cf = (w < ' ') ? NS_LAST : 0;        /* Set last segment flag if end of path */
#if _FS_RPATH

    if((di == 1 && lfn[di - 1] == '.') ||  /* Is this a dot entry? */
            (di == 2 && lfn[di - 1] == '.' && lfn[di - 2] == '.'))
    {
        lfn[di] = 0;

        for(i = 0; i < 11; i++)
        {
            dp->fn[i] = (i < di) ? '.' : ' ';
        }

        dp->fn[i] = cf | NS_DOT;        /* This is a dot entry */
        return FR_OK;
    }

#endif

    while(di)                           /* Strip trailing spaces and dots */
    {
        w = lfn[di - 1];

        if(w != ' ' && w != '.')
        {
            break;
        }

        di--;
    }

    if(!di)
    {
        return FR_INVALID_NAME;    /* Reject nul string */
    }

    lfn[di] = 0;                        /* LFN is created */
    /* Create SFN in directory form */
    mem_set(dp->fn, ' ', 11);

    for(si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++);     /* Strip leading spaces and dots */

    if(si)
    {
        cf |= NS_LOSS | NS_LFN;
    }

    while(di && lfn[di - 1] != '.')
    {
        di--;    /* Find extension (di<=si: no extension) */
    }

    b = i = 0;
    ni = 8;

    for(;;)
    {
        w = lfn[si++];                    /* Get an LFN character */

        if(!w)
        {
            break;    /* Break on end of the LFN */
        }

        if(w == ' ' || (w == '.' && si != di))       /* Remove spaces and dots */
        {
            cf |= NS_LOSS | NS_LFN;
            continue;
        }

        if(i >= ni || si == di)           /* Extension or end of SFN */
        {
            if(ni == 11)                   /* Long extension */
            {
                cf |= NS_LOSS | NS_LFN;
                break;
            }

            if(si != di)
            {
                cf |= NS_LOSS | NS_LFN;    /* Out of 8.3 format */
            }

            if(si > di)
            {
                break;    /* No extension */
            }

            si = di;
            i = 8;
            ni = 11;    /* Enter extension section */
            b <<= 2;
            continue;
        }

        if(w >= 0x80)                   /* Non ASCII character */
        {
#ifdef _EXCVT
            w = ff_convert(w, 0);        /* Unicode -> OEM code */

            if(w)
            {
                w = ExCvt[w - 0x80];    /* Convert extended character to upper (SBCS) */
            }

#else
            w = ff_convert(ff_wtoupper(w), 0);    /* Upper converted Unicode -> OEM code */
#endif
            cf |= NS_LFN;                /* Force create LFN entry */
        }

        if(_DF1S && w >= 0x100)           /* Double byte character (always false on SBCS cfg) */
        {
            if(i >= ni - 1)
            {
                cf |= NS_LOSS | NS_LFN;
                i = ni;
                continue;
            }

            dp->fn[i++] = (BYTE)(w >> 8);
        }
        else                          /* Single byte character */
        {
            if(!w || chk_chr("+,;=[]", w))       /* Replace illegal characters for SFN */
            {
                w = '_';
                cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
            }
            else
            {
                if(IsUpper(w))           /* ASCII large capital */
                {
                    b |= 2;
                }
                else
                {
                    if(IsLower(w))       /* ASCII small capital */
                    {
                        b |= 1;
                        w -= 0x20;
                    }
                }
            }
        }

        dp->fn[i++] = (BYTE)w;
    }

    if(dp->fn[0] == DDE)
    {
        dp->fn[0] = NDDE;    /* If the first character collides with deleted mark, replace it with 0x05 */
    }

    if(ni == 8)
    {
        b <<= 2;
    }

    if((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)     /* Create LFN entry when there are composite capitals */
    {
        cf |= NS_LFN;
    }

    if(!(cf & NS_LFN))                           /* When LFN is in 8.3 format without extended character, NT flags are created */
    {
        if((b & 0x03) == 0x01)
        {
            cf |= NS_EXT;    /* NT flag (Extension has only small capital) */
        }

        if((b & 0x0C) == 0x04)
        {
            cf |= NS_BODY;    /* NT flag (Filename has only small capital) */
        }
    }

    dp->fn[NSFLAG] = cf;    /* SFN is created */
    return FR_OK;
#else    /* Non-LFN configuration */
    BYTE b, c, d, *sfn;
    UINT ni, si, i;
    const char *p;

    /* Create file name in directory form */
    for(p = *path; *p == '/' || *p == '\\'; p++);     /* Strip duplicated separator */

    sfn = dp->fn;
    mem_set(sfn, ' ', 11);
    si = i = b = 0;
    ni = 8;
#if _FS_RPATH

    if(p[si] == '.')    /* Is this a dot entry? */
    {
        for(;;)
        {
            c = (BYTE)p[si++];

            if(c != '.' || si >= 3)
            {
                break;
            }

            sfn[i++] = c;
        }

        if(c != '/' && c != '\\' && c > ' ')
        {
            return FR_INVALID_NAME;
        }

        *path = &p[si];                                    /* Return pointer to the next segment */
        sfn[NSFLAG] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;    /* Set last segment flag if end of path */
        return FR_OK;
    }

#endif

    for(;;)
    {
        c = (BYTE)p[si++];

        if(c <= ' ' || c == '/' || c == '\\')
        {
            break;    /* Break on end of segment */
        }

        if(c == '.' || i >= ni)
        {
            if(ni != 8 || c != '.')
            {
                return FR_INVALID_NAME;
            }

            i = 8;
            ni = 11;
            b <<= 2;
            continue;
        }

        if(c >= 0x80)                   /* Extended character? */
        {
            b |= 3;                        /* Eliminate NT flag */
#ifdef _EXCVT
            c = ExCvt[c - 0x80];        /* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
            return FR_INVALID_NAME;        /* Reject extended characters (ASCII cfg) */
#endif
#endif
        }

        if(IsDBCS1(c))                   /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
        {
            d = (BYTE)p[si++];            /* Get 2nd byte */

            if(!IsDBCS2(d) || i >= ni - 1)     /* Reject invalid DBC */
            {
                return FR_INVALID_NAME;
            }

            sfn[i++] = c;
            sfn[i++] = d;
        }
        else                          /* Single byte code */
        {
            if(chk_chr("\"*+,:;<=>\?[]|\x7F", c))     /* Reject illegal chrs for SFN */
            {
                return FR_INVALID_NAME;
            }

            if(IsUpper(c))               /* ASCII large capital? */
            {
                b |= 2;
            }
            else
            {
                if(IsLower(c))           /* ASCII small capital? */
                {
                    b |= 1;
                    c -= 0x20;
                }
            }

            sfn[i++] = c;
        }
    }

    *path = &p[si];                        /* Return pointer to the next segment */
    c = (c <= ' ') ? NS_LAST : 0;        /* Set last segment flag if end of path */

    if(!i)
    {
        return FR_INVALID_NAME;    /* Reject nul string */
    }

    if(sfn[0] == DDE)
    {
        sfn[0] = NDDE;    /* When first character collides with DDE, replace it with 0x05 */
    }

    if(ni == 8)
    {
        b <<= 2;
    }

    if((b & 0x03) == 0x01)
    {
        c |= NS_EXT;    /* NT flag (Name extension has only small capital) */
    }

    if((b & 0x0C) == 0x04)
    {
        c |= NS_BODY;    /* NT flag (Name body has only small capital) */
    }

    sfn[NSFLAG] = c;        /* Store NT flag, File name is created */
    return FR_OK;
#endif
}




/*-----------------------------------------------------------------------*/
/* Follow a file path                                                    */
/*-----------------------------------------------------------------------*/

static
FRESULT follow_path(    /* FR_OK(0): successful, !=0: error code */
    DIR *dp,            /* Directory object to return last directory and found object */
    const TCHAR *path    /* Full-path string to find a file or directory */
)
{
    FRESULT res;
    BYTE *dir, ns;
#if _FS_RPATH

    if(*path == '/' || *path == '\\')       /* There is a heading separator */
    {
        path++;
        dp->sclust = 0;                /* Strip it and start from the root directory */
    }
    else                                  /* No heading separator */
    {
        dp->sclust = dp->fs->cdir;            /* Start from the current directory */
    }

#else

    if(*path == '/' || *path == '\\')         /* Strip heading separator if exist */
    {
        path++;
    }

    dp->sclust = 0;                            /* Always start from the root directory */
#endif

    if((UINT)*path < ' ')                   /* Null path name is the origin directory itself */
    {
        res = dir_sdi(dp, 0);
        dp->dir = 0;
    }
    else                                  /* Follow path */
    {
        for(;;)
        {
            res = create_name(dp, &path);    /* Get a segment name of the path */

            if(res != FR_OK)
            {
                break;
            }

            res = dir_find(dp);                /* Find an object with the sagment name */
            ns = dp->fn[NSFLAG];

            if(res != FR_OK)                   /* Failed to find the object */
            {
                if(res == FR_NO_FILE)       /* Object is not found */
                {
                    if(_FS_RPATH && (ns & NS_DOT))       /* If dot entry is not exist, */
                    {
                        dp->sclust = 0;
                        dp->dir = 0;    /* it is the root directory and stay there */

                        if(!(ns & NS_LAST))
                        {
                            continue;    /* Continue to follow if not last segment */
                        }

                        res = FR_OK;                    /* Ended at the root directroy. Function completed. */
                    }
                    else                              /* Could not find the object */
                    {
                        if(!(ns & NS_LAST))
                        {
                            res = FR_NO_PATH;    /* Adjust error code if not last segment */
                        }
                    }
                }

                break;
            }

            if(ns & NS_LAST)
            {
                break;    /* Last segment matched. Function completed. */
            }

            dir = dp->dir;                        /* Follow the sub-directory */

            if(!(dir[DIR_Attr] & AM_DIR))       /* It is not a sub-directory and cannot follow */
            {
                res = FR_NO_PATH;
                break;
            }

            dp->sclust = ld_clust(dp->fs, dir);
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Get logical drive number from path name                               */
/*-----------------------------------------------------------------------*/

static
int get_ldnumber(        /* Returns logical drive number (-1:invalid drive) */
    const TCHAR **path    /* Pointer to pointer to the path name */
)
{
    const TCHAR *tp, *tt;
    UINT i;
    int vol = -1;

    if(*path)       /* If the pointer is not a null */
    {
        for(tt = *path; (UINT)*tt >= (_USE_LFN ? ' ' : '!') && *tt != ':'; tt++);     /* Find ':' in the path */

        if(*tt == ':')       /* If a ':' is exist in the path name */
        {
            tp = *path;
            i = *tp++ - '0';

            if(i < 10 && tp == tt)       /* Is there a numeric drive id? */
            {
                if(i < _VOLUMES)       /* If a drive id is found, get the value and strip it */
                {
                    vol = (int)i;
                    *path = ++tt;
                }
            }
            else      /* No numeric drive number */
            {
#if _STR_VOLUME_ID        /* Find string drive id */
                static const char *const str[] = { _VOLUME_STRS };
                const char *sp;
                char c;
                TCHAR tc;
                i = 0;
                tt++;

                do
                {
                    sp = str[i];
                    tp = *path;

                    do      /* Compare a string drive id with path name */
                    {
                        c = *sp++;
                        tc = *tp++;

                        if(IsLower(tc))
                        {
                            tc -= 0x20;
                        }
                    }
                    while(c && (TCHAR)c == tc);
                }
                while((c || tp != tt) && ++i < _VOLUMES);       /* Repeat for each id until pattern match */

                if(i < _VOLUMES)       /* If a drive id is found, get the value and strip it */
                {
                    vol = (int)i;
                    *path = tt;
                }

#endif
            }

            return vol;
        }

#if _FS_RPATH && _VOLUMES >= 2
        vol = CurrVol;    /* Current drive */
#else
        vol = 0;        /* Drive 0 */
#endif
    }

    return vol;
}




/*-----------------------------------------------------------------------*/
/* Load a sector and check if it is an FAT boot sector                   */
/*-----------------------------------------------------------------------*/

static
BYTE check_fs(    /* 0:FAT boor sector, 1:Valid boor sector but not FAT, 2:Not a boot sector, 3:Disk error */
    FATFS *fs,    /* File system object */
    DWORD sect    /* Sector# (lba) to check if it is an FAT boot record or not */
)
{
    fs->wflag = 0;
    fs->winsect = 0xFFFFFFFF;    /* Invaidate window */

    if(move_window(fs, sect) != FR_OK)             /* Load boot record */
    {
        return 3;
    }

    if(LD_WORD(&fs->win[BS_55AA]) != 0xAA55)     /* Check boot record signature (always placed at offset 510 even if the sector size is >512) */
    {
        return 2;
    }

    if((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)         /* Check "FAT" string */
    {
        return 0;
    }

    if((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)     /* Check "FAT" string */
    {
        return 0;
    }

    return 1;
}




/*-----------------------------------------------------------------------*/
/* Find logical drive and check if the volume is mounted                 */
/*-----------------------------------------------------------------------*/

static
FRESULT find_volume(    /* FR_OK(0): successful, !=0: any error occurred */
    FATFS **rfs,        /* Pointer to pointer to the found file system object */
    const TCHAR **path,    /* Pointer to pointer to the path name (drive number) */
    BYTE wmode            /* !=0: Check write protection for write access */
)
{
    BYTE fmt;
    int vol;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
    WORD nrsv;
    FATFS *fs;
    /* Get logical drive number from the path name */
    *rfs = 0;
    vol = get_ldnumber(path);

    if(vol < 0)
    {
        return FR_INVALID_DRIVE;
    }

    /* Check if the file system object is valid or not */
    fs = FatFs[vol];                    /* Get pointer to the file system object */

    if(!fs)
    {
        return FR_NOT_ENABLED;    /* Is the file system object available? */
    }

    ENTER_FF(fs);                        /* Lock the volume */
    *rfs = fs;                            /* Return pointer to the file system object */

    if(fs->fs_type)                       /* If the volume has been mounted */
    {
        stat = disk_status(fs->drv);

        if(!(stat & STA_NOINIT))           /* and the physical drive is kept initialized */
        {
            if(!_FS_READONLY && wmode && (stat & STA_PROTECT))     /* Check write protection if needed */
            {
                return FR_WRITE_PROTECTED;
            }

            return FR_OK;                /* The file system object is valid */
        }
    }

    /* The file system object is not valid. */
    /* Following code attempts to mount the volume. (analyze BPB and initialize the fs object) */
    fs->fs_type = 0;                    /* Clear the file system object */
    fs->drv = LD2PD(vol);                /* Bind the logical drive and a physical drive */
    stat = disk_initialize(fs->drv);    /* Initialize the physical drive */

    if(stat & STA_NOINIT)                 /* Check if the initialization succeeded */
    {
        return FR_NOT_READY;    /* Failed to initialize due to no medium or hard error */
    }

    if(!_FS_READONLY && wmode && (stat & STA_PROTECT))     /* Check disk write protection if needed */
    {
        return FR_WRITE_PROTECTED;
    }

#if _MAX_SS != _MIN_SS                        /* Get sector size (multiple sector size cfg only) */

    if(disk_ioctl(fs->drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK
            || SS(fs) < _MIN_SS || SS(fs) > _MAX_SS)
    {
        return FR_DISK_ERR;
    }

#endif
    /* Find an FAT partition on the drive. Supports only generic partitioning, FDISK and SFD. */
    bsect = 0;
    fmt = check_fs(fs, bsect);                    /* Load sector 0 and check if it is an FAT boot sector as SFD */

    if(fmt == 1 || (!fmt && (LD2PT(vol))))       /* Not an FAT boot sector or forced partition number */
    {
        UINT i;
        DWORD br[4];

        for(i = 0; i < 4; i++)               /* Get partition offset */
        {
            BYTE *pt = fs->win + MBR_Table + i * SZ_PTE;
            br[i] = pt[4] ? LD_DWORD(&pt[8]) : 0;
        }

        i = LD2PT(vol);                        /* Partition number: 0:auto, 1-4:forced */

        if(i)
        {
            i--;
        }

        do                                  /* Find an FAT volume */
        {
            bsect = br[i];
            fmt = bsect ? check_fs(fs, bsect) : 2;    /* Check the partition */
        }
        while(!LD2PT(vol) && fmt && ++i < 4);
    }

    if(fmt == 3)
    {
        return FR_DISK_ERR;    /* An error occured in the disk I/O layer */
    }

    if(fmt)
    {
        return FR_NO_FILESYSTEM;    /* No FAT volume is found */
    }

    /* An FAT volume is found. Following code initializes the file system object */

    if(LD_WORD(fs->win + BPB_BytsPerSec) != SS(fs))         /* (BPB_BytsPerSec must be equal to the physical sector size) */
    {
        return FR_NO_FILESYSTEM;
    }

    fasize = LD_WORD(fs->win + BPB_FATSz16);                /* Number of sectors per FAT */

    if(!fasize)
    {
        fasize = LD_DWORD(fs->win + BPB_FATSz32);
    }

    fs->fsize = fasize;
    fs->n_fats = fs->win[BPB_NumFATs];                    /* Number of FAT copies */

    if(fs->n_fats != 1 && fs->n_fats != 2)                 /* (Must be 1 or 2) */
    {
        return FR_NO_FILESYSTEM;
    }

    fasize *= fs->n_fats;                                /* Number of sectors for FAT area */
    fs->csize = fs->win[BPB_SecPerClus];                /* Number of sectors per cluster */

    if(!fs->csize || (fs->csize & (fs->csize - 1)))     /* (Must be power of 2) */
    {
        return FR_NO_FILESYSTEM;
    }

    fs->n_rootdir = LD_WORD(fs->win + BPB_RootEntCnt);    /* Number of root directory entries */

    if(fs->n_rootdir % (SS(fs) / SZ_DIR))                 /* (Must be sector aligned) */
    {
        return FR_NO_FILESYSTEM;
    }

    tsect = LD_WORD(fs->win + BPB_TotSec16);                /* Number of sectors on the volume */

    if(!tsect)
    {
        tsect = LD_DWORD(fs->win + BPB_TotSec32);
    }

    nrsv = LD_WORD(fs->win + BPB_RsvdSecCnt);                /* Number of reserved sectors */

    if(!nrsv)
    {
        return FR_NO_FILESYSTEM;    /* (Must not be 0) */
    }

    /* Determine the FAT sub type */
    sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZ_DIR);    /* RSV+FAT+DIR */

    if(tsect < sysect)
    {
        return FR_NO_FILESYSTEM;    /* (Invalid volume size) */
    }

    nclst = (tsect - sysect) / fs->csize;                /* Number of clusters */

    if(!nclst)
    {
        return FR_NO_FILESYSTEM;    /* (Invalid volume size) */
    }

    fmt = FS_FAT12;

    if(nclst >= MIN_FAT16)
    {
        fmt = FS_FAT16;
    }

    if(nclst >= MIN_FAT32)
    {
        fmt = FS_FAT32;
    }

    /* Boundaries and Limits */
    fs->n_fatent = nclst + 2;                            /* Number of FAT entries */
    fs->volbase = bsect;                                /* Volume start sector */
    fs->fatbase = bsect + nrsv;                         /* FAT start sector */
    fs->database = bsect + sysect;                        /* Data start sector */

    if(fmt == FS_FAT32)
    {
        if(fs->n_rootdir)
        {
            return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must be 0) */
        }

        fs->dirbase = LD_DWORD(fs->win + BPB_RootClus);    /* Root directory start cluster */
        szbfat = fs->n_fatent * 4;                        /* (Needed FAT size) */
    }
    else
    {
        if(!fs->n_rootdir)
        {
            return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must not be 0) */
        }

        fs->dirbase = fs->fatbase + fasize;                /* Root directory start sector */
        szbfat = (fmt == FS_FAT16) ?                    /* (Needed FAT size) */
                 fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
    }

    if(fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))     /* (BPB_FATSz must not be less than the size needed) */
    {
        return FR_NO_FILESYSTEM;
    }

#if !_FS_READONLY
    /* Initialize cluster allocation information */
    fs->last_clust = fs->free_clust = 0xFFFFFFFF;
    /* Get fsinfo if available */
    fs->fsi_flag = 0x80;
#if (_FS_NOFSINFO & 3) != 3

    if(fmt == FS_FAT32                 /* Enable FSINFO only if FAT32 and BPB_FSInfo is 1 */
            && LD_WORD(fs->win + BPB_FSInfo) == 1
            && move_window(fs, bsect + 1) == FR_OK)
    {
        fs->fsi_flag = 0;

        if(LD_WORD(fs->win + BS_55AA) == 0xAA55     /* Load FSINFO data if available */
                && LD_DWORD(fs->win + FSI_LeadSig) == 0x41615252
                && LD_DWORD(fs->win + FSI_StrucSig) == 0x61417272)
        {
#if (_FS_NOFSINFO & 1) == 0
            fs->free_clust = LD_DWORD(fs->win + FSI_Free_Count);
#endif
#if (_FS_NOFSINFO & 2) == 0
            fs->last_clust = LD_DWORD(fs->win + FSI_Nxt_Free);
#endif
        }
    }

#endif
#endif
    fs->fs_type = fmt;    /* FAT sub-type */
    fs->id = ++Fsid;    /* File system mount ID */
#if _FS_RPATH
    fs->cdir = 0;        /* Set current directory to root */
#endif
#if _FS_LOCK            /* Clear file lock semaphores */
    clear_lock(fs);
#endif
    return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Check if the file/directory object is valid or not                    */
/*-----------------------------------------------------------------------*/

static
FRESULT validate(    /* FR_OK(0): The object is valid, !=0: Invalid */
    void *obj        /* Pointer to the object FIL/DIR to check validity */
)
{
    FIL *fil = (FIL *)obj;   /* Assuming offset of .fs and .id in the FIL/DIR structure is identical */

    if(!fil || !fil->fs || !fil->fs->fs_type || fil->fs->id != fil->id)
    {
        return FR_INVALID_OBJECT;
    }

    ENTER_FF(fil->fs);        /* Lock file system */

    if(disk_status(fil->fs->drv) & STA_NOINIT)
    {
        return FR_NOT_READY;
    }

    return FR_OK;
}




/*--------------------------------------------------------------------------

Public Functions

--------------------------------------------------------------------------*/



/*-----------------------------------------------------------------------*/
/* Mount/Unmount a Logical Drive                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_mount(
    FATFS *fs,            /* Pointer to the file system object (NULL:unmount)*/
    const TCHAR *path,    /* Logical drive number to be mounted/unmounted */
    BYTE opt            /* 0:Do not mount (delayed mount), 1:Mount immediately */
)
{
    FATFS *cfs;
    int vol;
    FRESULT res;
    const TCHAR *rp = path;
    vol = get_ldnumber(&rp);

    if(vol < 0)
    {
        return FR_INVALID_DRIVE;
    }

    cfs = FatFs[vol];                    /* Pointer to fs object */

    if(cfs)
    {
#if _FS_LOCK
        clear_lock(cfs);
#endif
#if _FS_REENTRANT                        /* Discard sync object of the current volume */

        if(!ff_del_syncobj(cfs->sobj))
        {
            return FR_INT_ERR;
        }

#endif
        cfs->fs_type = 0;                /* Clear old fs object */
    }

    if(fs)
    {
        fs->fs_type = 0;                /* Clear new fs object */
#if _FS_REENTRANT                        /* Create sync object for the new volume */

        if(!ff_cre_syncobj((BYTE)vol, &fs->sobj))
        {
            return FR_INT_ERR;
        }

#endif
    }

    FatFs[vol] = fs;                    /* Register new fs object */

    if(!fs || opt != 1)
    {
        return FR_OK;    /* Do not mount now, it will be mounted later */
    }

    res = find_volume(&fs, &path, 0);    /* Force mounted the volume */
    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Open or Create a File                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_open(
    FIL *fp,            /* Pointer to the blank file object */
    const TCHAR *path,    /* Pointer to the file name */
    BYTE mode            /* Access mode and file open mode flags */
)
{
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;

    if(!fp)
    {
        return FR_INVALID_OBJECT;
    }

    fp->fs = 0;            /* Clear file object */
    /* Get logical drive number */
#if !_FS_READONLY
    mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
    res = find_volume(&dj.fs, &path, (BYTE)(mode & ~FA_READ));
#else
    mode &= FA_READ;
    res = find_volume(&dj.fs, &path, 0);
#endif

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);    /* Follow the file path */
        dir = dj.dir;
#if !_FS_READONLY    /* R/W configuration */

        if(res == FR_OK)
        {
            if(!dir)     /* Default directory itself */
            {
                res = FR_INVALID_NAME;
            }

#if _FS_LOCK
            else
            {
                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
            }

#endif
        }

        /* Create or Open a file */
        if(mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW))
        {
            DWORD dw, cl;

            if(res != FR_OK)                       /* No file, create new */
            {
                if(res == FR_NO_FILE)             /* There is no file to open, create a new entry */
#if _FS_LOCK
                    res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;

#else
                    res = dir_register(&dj);
#endif
                mode |= FA_CREATE_ALWAYS;        /* File is created */
                dir = dj.dir;                    /* New entry */
            }
            else                                  /* Any object is already existing */
            {
                if(dir[DIR_Attr] & (AM_RDO | AM_DIR))       /* Cannot overwrite it (R/O or DIR) */
                {
                    res = FR_DENIED;
                }
                else
                {
                    if(mode & FA_CREATE_NEW)     /* Cannot create as new file */
                    {
                        res = FR_EXIST;
                    }
                }
            }

            if(res == FR_OK && (mode & FA_CREATE_ALWAYS))       /* Truncate it if overwrite mode */
            {
                dw = GET_FATTIME();                /* Created time */
                ST_DWORD(dir + DIR_CrtTime, dw);
                dir[DIR_Attr] = 0;                /* Reset attribute */
                ST_DWORD(dir + DIR_FileSize, 0);    /* size = 0 */
                cl = ld_clust(dj.fs, dir);        /* Get start cluster */
                st_clust(dir, 0);                /* cluster = 0 */
                dj.fs->wflag = 1;

                if(cl)                           /* Remove the cluster chain if exist */
                {
                    dw = dj.fs->winsect;
                    res = remove_chain(dj.fs, cl);

                    if(res == FR_OK)
                    {
                        dj.fs->last_clust = cl - 1;    /* Reuse the cluster hole */
                        res = move_window(dj.fs, dw);
                    }
                }
            }
        }
        else      /* Open an existing file */
        {
            if(res == FR_OK)                       /* Follow succeeded */
            {
                if(dir[DIR_Attr] & AM_DIR)       /* It is a directory */
                {
                    res = FR_NO_FILE;
                }
                else
                {
                    if((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO))  /* R/O violation */
                    {
                        res = FR_DENIED;
                    }
                }
            }
        }

        if(res == FR_OK)
        {
            if(mode & FA_CREATE_ALWAYS)         /* Set file change flag if created or overwritten */
            {
                mode |= FA__WRITTEN;
            }

            fp->dir_sect = dj.fs->winsect;        /* Pointer to the directory entry */
            fp->dir_ptr = dir;
#if _FS_LOCK
            fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);

            if(!fp->lockid)
            {
                res = FR_INT_ERR;
            }

#endif
        }

#else                /* R/O configuration */

        if(res == FR_OK)                       /* Follow succeeded */
        {
            dir = dj.dir;

            if(!dir)                           /* Current directory itself */
            {
                res = FR_INVALID_NAME;
            }
            else
            {
                if(dir[DIR_Attr] & AM_DIR)     /* It is a directory */
                {
                    res = FR_NO_FILE;
                }
            }
        }

#endif
        FREE_BUF();

        if(res == FR_OK)
        {
            fp->flag = mode;                    /* File access mode */
            fp->err = 0;                        /* Clear error flag */
            fp->sclust = ld_clust(dj.fs, dir);    /* File start cluster */
            fp->fsize = LD_DWORD(dir + DIR_FileSize);    /* File size */
            fp->fptr = 0;                        /* File pointer */
            fp->dsect = 0;
#if _USE_FASTSEEK
            fp->cltbl = 0;                        /* Normal seek mode */
#endif
            fp->fs = dj.fs;                         /* Validate file object */
            fp->id = fp->fs->id;
        }
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Read File                                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_read(
    FIL *fp,         /* Pointer to the file object */
    void *buff,        /* Pointer to data buffer */
    UINT btr,        /* Number of bytes to read */
    UINT *br        /* Pointer to number of bytes read */
)
{
    FRESULT res;
    DWORD clst, sect, remain;
    UINT rcnt, cc;
    BYTE csect, *rbuff = (BYTE *)buff;
    *br = 0;    /* Clear read byte counter */
    res = validate(fp);                            /* Check validity */

    if(res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }

    if(fp->err)                                 /* Check error */
    {
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    }

    if(!(fp->flag & FA_READ))                      /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }

    remain = fp->fsize - fp->fptr;

    if(btr > remain)
    {
        btr = (UINT)remain;    /* Truncate btr by remaining bytes */
    }

    for(;  btr;                                 /* Repeat until all data read */
            rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt)
    {
        if((fp->fptr % SS(fp->fs)) == 0)           /* On the sector boundary? */
        {
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */

            if(!csect)                           /* On the cluster boundary? */
            {
                if(fp->fptr == 0)               /* On the top of the file? */
                {
                    clst = fp->sclust;            /* Follow from the origin */
                }
                else                          /* Middle or end of the file */
                {
#if _USE_FASTSEEK

                    if(fp->cltbl)
                    {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    }
                    else
#endif
                        clst = get_fat(fp->fs, fp->clust);    /* Follow cluster chain on the FAT */
                }

                if(clst < 2)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }

                if(clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->clust = clst;                /* Update current cluster */
            }

            sect = clust2sect(fp->fs, fp->clust);    /* Get current sector */

            if(!sect)
            {
                ABORT(fp->fs, FR_INT_ERR);
            }

            sect += csect;
            cc = btr / SS(fp->fs);                /* When remaining bytes >= sector size, */

            if(cc)                               /* Read maximum contiguous sectors directly */
            {
                if(csect + cc > fp->fs->csize)     /* Clip at cluster boundary */
                {
                    cc = fp->fs->csize - csect;
                }

                if(disk_read(fp->fs->drv, rbuff, sect, cc) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

#if !_FS_READONLY && _FS_MINIMIZE <= 2            /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY

                if(fp->fs->wflag && fp->fs->winsect - sect < cc)
                {
                    mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
                }

#else

                if((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
                {
                    mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
                }

#endif
#endif
                rcnt = SS(fp->fs) * cc;            /* Number of bytes transferred */
                continue;
            }

#if !_FS_TINY

            if(fp->dsect != sect)               /* Load data sector if not in cache */
            {
#if !_FS_READONLY

                if(fp->flag & FA__DIRTY)           /* Write-back dirty sector cache */
                {
                    if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }

                    fp->flag &= ~FA__DIRTY;
                }

#endif

                if(disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)     /* Fill sector cache */
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
            }

#endif
            fp->dsect = sect;
        }

        rcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));    /* Get partial sector data from sector buffer */

        if(rcnt > btr)
        {
            rcnt = btr;
        }

#if _FS_TINY

        if(move_window(fp->fs, fp->dsect) != FR_OK)         /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }

        mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);    /* Pick partial sector */
#else
        mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);    /* Pick partial sector */
#endif
    }

    LEAVE_FF(fp->fs, FR_OK);
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Write File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_write(
    FIL *fp,            /* Pointer to the file object */
    const void *buff,    /* Pointer to the data to be written */
    UINT btw,            /* Number of bytes to write */
    UINT *bw            /* Pointer to number of bytes written */
)
{
    FRESULT res;
    DWORD clst, sect;
    UINT wcnt, cc;
    const BYTE *wbuff = (const BYTE *)buff;
    BYTE csect;
    *bw = 0;    /* Clear write byte counter */
    res = validate(fp);                        /* Check validity */

    if(res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }

    if(fp->err)                             /* Check error */
    {
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    }

    if(!(fp->flag & FA_WRITE))                 /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }

    if(fp->fptr + btw < fp->fptr)
    {
        btw = 0;    /* File size cannot reach 4GB */
    }

    for(;  btw;                             /* Repeat until all data written */
            wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt)
    {
        if((fp->fptr % SS(fp->fs)) == 0)       /* On the sector boundary? */
        {
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */

            if(!csect)                       /* On the cluster boundary? */
            {
                if(fp->fptr == 0)           /* On the top of the file? */
                {
                    clst = fp->sclust;        /* Follow from the origin */

                    if(clst == 0)             /* When no cluster is allocated, */
                    {
                        clst = create_chain(fp->fs, 0);    /* Create a new cluster chain */
                    }
                }
                else                      /* Middle or end of the file */
                {
#if _USE_FASTSEEK

                    if(fp->cltbl)
                    {
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    }
                    else
#endif
                        clst = create_chain(fp->fs, fp->clust);    /* Follow or stretch cluster chain on the FAT */
                }

                if(clst == 0)
                {
                    break;    /* Could not allocate a new cluster (disk full) */
                }

                if(clst == 1)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }

                if(clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->clust = clst;            /* Update current cluster */

                if(fp->sclust == 0)
                {
                    fp->sclust = clst;    /* Set start cluster if the first write */
                }
            }

#if _FS_TINY

            if(fp->fs->winsect == fp->dsect && sync_window(fp->fs))     /* Write-back sector cache */
            {
                ABORT(fp->fs, FR_DISK_ERR);
            }

#else

            if(fp->flag & FA__DIRTY)           /* Write-back sector cache */
            {
                if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->flag &= ~FA__DIRTY;
            }

#endif
            sect = clust2sect(fp->fs, fp->clust);    /* Get current sector */

            if(!sect)
            {
                ABORT(fp->fs, FR_INT_ERR);
            }

            sect += csect;
            cc = btw / SS(fp->fs);            /* When remaining bytes >= sector size, */

            if(cc)                           /* Write maximum contiguous sectors directly */
            {
                if(csect + cc > fp->fs->csize)     /* Clip at cluster boundary */
                {
                    cc = fp->fs->csize - csect;
                }

                if(disk_write(fp->fs->drv, wbuff, sect, cc) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

#if _FS_MINIMIZE <= 2
#if _FS_TINY

                if(fp->fs->winsect - sect < cc)       /* Refill sector cache if it gets invalidated by the direct write */
                {
                    mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->fs->wflag = 0;
                }

#else

                if(fp->dsect - sect < cc)    /* Refill sector cache if it gets invalidated by the direct write */
                {
                    mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->flag &= ~FA__DIRTY;
                }

#endif
#endif
                wcnt = SS(fp->fs) * cc;        /* Number of bytes transferred */
                continue;
            }

#if _FS_TINY

            if(fp->fptr >= fp->fsize)       /* Avoid silly cache filling at growing edge */
            {
                if(sync_window(fp->fs))
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->fs->winsect = sect;
            }

#else

            if(fp->dsect != sect)           /* Fill sector cache with file data */
            {
                if(fp->fptr < fp->fsize &&
                        disk_read(fp->fs->drv, fp->buf, sect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }
            }

#endif
            fp->dsect = sect;
        }

        wcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */

        if(wcnt > btw)
        {
            wcnt = btw;
        }

#if _FS_TINY

        if(move_window(fp->fs, fp->dsect) != FR_OK)     /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }

        mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);    /* Fit partial sector */
        fp->fs->wflag = 1;
#else
        mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);    /* Fit partial sector */
        fp->flag |= FA__DIRTY;
#endif
    }

    if(fp->fptr > fp->fsize)
    {
        fp->fsize = fp->fptr;    /* Update file size if needed */
    }

    fp->flag |= FA__WRITTEN;                        /* Set file change flag */
    LEAVE_FF(fp->fs, FR_OK);
}




/*-----------------------------------------------------------------------*/
/* Synchronize the File                                                  */
/*-----------------------------------------------------------------------*/

FRESULT f_sync(
    FIL *fp        /* Pointer to the file object */
)
{
    FRESULT res;
    DWORD tm;
    BYTE *dir;
    res = validate(fp);                    /* Check validity of the object */

    if(res == FR_OK)
    {
        if(fp->flag & FA__WRITTEN)       /* Has the file been written? */
        {
            /* Write-back dirty buffer */
#if !_FS_TINY
            if(fp->flag & FA__DIRTY)
            {
                if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    LEAVE_FF(fp->fs, FR_DISK_ERR);
                }

                fp->flag &= ~FA__DIRTY;
            }

#endif
            /* Update the directory entry */
            res = move_window(fp->fs, fp->dir_sect);

            if(res == FR_OK)
            {
                dir = fp->dir_ptr;
                dir[DIR_Attr] |= AM_ARC;                    /* Set archive bit */
                ST_DWORD(dir + DIR_FileSize, fp->fsize);        /* Update file size */
                st_clust(dir, fp->sclust);                    /* Update start cluster */
                tm = GET_FATTIME();                            /* Update updated time */
                ST_DWORD(dir + DIR_WrtTime, tm);
                ST_WORD(dir + DIR_LstAccDate, 0);
                fp->flag &= ~FA__WRITTEN;
                fp->fs->wflag = 1;
                res = sync_fs(fp->fs);
            }
        }
    }

    LEAVE_FF(fp->fs, res);
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close(
    FIL *fp        /* Pointer to the file object to be closed */
)
{
    FRESULT res;
#if !_FS_READONLY
    res = f_sync(fp);                    /* Flush cached data */

    if(res == FR_OK)
#endif
    {
        res = validate(fp);                /* Lock volume */

        if(res == FR_OK)
        {
#if _FS_REENTRANT
            FATFS *fs = fp->fs;
#endif
#if _FS_LOCK
            res = dec_lock(fp->lockid);    /* Decrement file open counter */

            if(res == FR_OK)
#endif
                fp->fs = 0;                /* Invalidate file object */

#if _FS_REENTRANT
            unlock_fs(fs, FR_OK);        /* Unlock volume */
#endif
        }
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Change Current Directory or Current Drive, Get Current Directory      */
/*-----------------------------------------------------------------------*/

#if _FS_RPATH >= 1
#if _VOLUMES >= 2
FRESULT f_chdrive(
    const TCHAR *path        /* Drive number */
)
{
    int vol;
    vol = get_ldnumber(&path);

    if(vol < 0)
    {
        return FR_INVALID_DRIVE;
    }

    CurrVol = (BYTE)vol;
    return FR_OK;
}
#endif


FRESULT f_chdir(
    const TCHAR *path    /* Pointer to the directory path */
)
{
    FRESULT res;
    DIR dj;
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);        /* Follow the path */
        FREE_BUF();

        if(res == FR_OK)                       /* Follow completed */
        {
            if(!dj.dir)
            {
                dj.fs->cdir = dj.sclust;    /* Start directory itself */
            }
            else
            {
                if(dj.dir[DIR_Attr] & AM_DIR)     /* Reached to the directory */
                {
                    dj.fs->cdir = ld_clust(dj.fs, dj.dir);
                }
                else
                {
                    res = FR_NO_PATH;    /* Reached but a file */
                }
            }
        }

        if(res == FR_NO_FILE)
        {
            res = FR_NO_PATH;
        }
    }

    LEAVE_FF(dj.fs, res);
}


#if _FS_RPATH >= 2
FRESULT f_getcwd(
    TCHAR *buff,    /* Pointer to the directory path */
    UINT len        /* Size of path */
)
{
    FRESULT res;
    DIR dj;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp;
    FILINFO fno;
    DEF_NAMEBUF;
    *buff = 0;
    /* Get logical drive number */
    res = find_volume(&dj.fs, (const TCHAR **)&buff, 0);   /* Get current volume */

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        i = len;            /* Bottom of buffer (directory stack base) */
        dj.sclust = dj.fs->cdir;            /* Start to follow upper directory from current directory */

        while((ccl = dj.sclust) != 0)       /* Repeat while current directory is a sub-directory */
        {
            res = dir_sdi(&dj, 1);            /* Get parent directory */

            if(res != FR_OK)
            {
                break;
            }

            res = dir_read(&dj, 0);

            if(res != FR_OK)
            {
                break;
            }

            dj.sclust = ld_clust(dj.fs, dj.dir);    /* Goto parent directory */
            res = dir_sdi(&dj, 0);

            if(res != FR_OK)
            {
                break;
            }

            do                              /* Find the entry links to the child directory */
            {
                res = dir_read(&dj, 0);

                if(res != FR_OK)
                {
                    break;
                }

                if(ccl == ld_clust(dj.fs, dj.dir))
                {
                    break;    /* Found the entry */
                }

                res = dir_next(&dj, 0);
            }
            while(res == FR_OK);

            if(res == FR_NO_FILE)
            {
                res = FR_INT_ERR;    /* It cannot be 'not found'. */
            }

            if(res != FR_OK)
            {
                break;
            }

#if _USE_LFN
            fno.lfname = buff;
            fno.lfsize = i;
#endif
            get_fileinfo(&dj, &fno);        /* Get the directory name and push it to the buffer */
            tp = fno.fname;
#if _USE_LFN

            if(*buff)
            {
                tp = buff;
            }

#endif

            for(n = 0; tp[n]; n++);

            if(i < n + 3)
            {
                res = FR_NOT_ENOUGH_CORE;
                break;
            }

            while(n)
            {
                buff[--i] = tp[--n];
            }

            buff[--i] = '/';
        }

        tp = buff;

        if(res == FR_OK)
        {
#if _VOLUMES >= 2
            * tp++ = '0' + CurrVol;            /* Put drive number */
            *tp++ = ':';
#endif

            if(i == len)                       /* Root-directory */
            {
                *tp++ = '/';
            }
            else                          /* Sub-directroy */
            {
                do        /* Add stacked path str */
                {
                    *tp++ = buff[i++];
                }
                while(i < len);
            }
        }

        *tp = 0;
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 2 */
#endif /* _FS_RPATH >= 1 */



#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File R/W Pointer                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek(
    FIL *fp,        /* Pointer to the file object */
    DWORD ofs        /* File pointer from top of file */
)
{
    FRESULT res;
    res = validate(fp);                    /* Check validity of the object */

    if(res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }

    if(fp->err)                         /* Check error */
    {
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    }

#if _USE_FASTSEEK

    if(fp->cltbl)       /* Fast seek */
    {
        DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;

        if(ofs == CREATE_LINKMAP)       /* Create CLMT */
        {
            tbl = fp->cltbl;
            tlen = *tbl++;
            ulen = 2;    /* Given table size and required table size */
            cl = fp->sclust;            /* Top of the chain */

            if(cl)
            {
                do
                {
                    /* Get a fragment */
                    tcl = cl;
                    ncl = 0;
                    ulen += 2;    /* Top, length and used items */

                    do
                    {
                        pcl = cl;
                        ncl++;
                        cl = get_fat(fp->fs, cl);

                        if(cl <= 1)
                        {
                            ABORT(fp->fs, FR_INT_ERR);
                        }

                        if(cl == 0xFFFFFFFF)
                        {
                            ABORT(fp->fs, FR_DISK_ERR);
                        }
                    }
                    while(cl == pcl + 1);

                    if(ulen <= tlen)           /* Store the length and top of the fragment */
                    {
                        *tbl++ = ncl;
                        *tbl++ = tcl;
                    }
                }
                while(cl < fp->fs->n_fatent);       /* Repeat until end of chain */
            }

            *fp->cltbl = ulen;    /* Number of items used */

            if(ulen <= tlen)
            {
                *tbl = 0;    /* Terminate table */
            }
            else
            {
                res = FR_NOT_ENOUGH_CORE;    /* Given table size is smaller than required */
            }
        }
        else                          /* Fast seek */
        {
            if(ofs > fp->fsize)         /* Clip offset at the file size */
            {
                ofs = fp->fsize;
            }

            fp->fptr = ofs;                /* Set file pointer */

            if(ofs)
            {
                fp->clust = clmt_clust(fp, ofs - 1);
                dsc = clust2sect(fp->fs, fp->clust);

                if(!dsc)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }

                dsc += (ofs - 1) / SS(fp->fs) & (fp->fs->csize - 1);

                if(fp->fptr % SS(fp->fs) && dsc != fp->dsect)       /* Refill sector cache if needed */
                {
#if !_FS_TINY
#if !_FS_READONLY

                    if(fp->flag & FA__DIRTY)           /* Write-back dirty sector cache */
                    {
                        if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                        {
                            ABORT(fp->fs, FR_DISK_ERR);
                        }

                        fp->flag &= ~FA__DIRTY;
                    }

#endif

                    if(disk_read(fp->fs->drv, fp->buf, dsc, 1) != RES_OK)     /* Load current sector */
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }

#endif
                    fp->dsect = dsc;
                }
            }
        }
    }
    else
#endif
        /* Normal Seek */
    {
        DWORD clst, bcs, nsect, ifptr;

        if(ofs > fp->fsize                     /* In read-only mode, clip offset with the file size */
#if !_FS_READONLY
                && !(fp->flag & FA_WRITE)
#endif
          )
        {
            ofs = fp->fsize;
        }

        ifptr = fp->fptr;
        fp->fptr = nsect = 0;

        if(ofs)
        {
            bcs = (DWORD)fp->fs->csize * SS(fp->fs);    /* Cluster size (byte) */

            if(ifptr > 0 &&
                    (ofs - 1) / bcs >= (ifptr - 1) / bcs)      /* When seek to same or following cluster, */
            {
                fp->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->clust;
            }
            else                                      /* When seek to back cluster, */
            {
                clst = fp->sclust;                        /* start from the first cluster */
#if !_FS_READONLY

                if(clst == 0)                           /* If no cluster chain, create a new chain */
                {
                    clst = create_chain(fp->fs, 0);

                    if(clst == 1)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }

                    if(clst == 0xFFFFFFFF)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }

                    fp->sclust = clst;
                }

#endif
                fp->clust = clst;
            }

            if(clst != 0)
            {
                while(ofs > bcs)                           /* Cluster following loop */
                {
#if !_FS_READONLY

                    if(fp->flag & FA_WRITE)               /* Check if in write mode or not */
                    {
                        clst = create_chain(fp->fs, clst);    /* Force stretch if in write mode */

                        if(clst == 0)                   /* When disk gets full, clip file size */
                        {
                            ofs = bcs;
                            break;
                        }
                    }
                    else
#endif
                        clst = get_fat(fp->fs, clst);    /* Follow cluster chain if not in write mode */

                    if(clst == 0xFFFFFFFF)
                    {
                        ABORT(fp->fs, FR_DISK_ERR);
                    }

                    if(clst <= 1 || clst >= fp->fs->n_fatent)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }

                    fp->clust = clst;
                    fp->fptr += bcs;
                    ofs -= bcs;
                }

                fp->fptr += ofs;

                if(ofs % SS(fp->fs))
                {
                    nsect = clust2sect(fp->fs, clst);    /* Current sector */

                    if(!nsect)
                    {
                        ABORT(fp->fs, FR_INT_ERR);
                    }

                    nsect += ofs / SS(fp->fs);
                }
            }
        }

        if(fp->fptr % SS(fp->fs) && nsect != fp->dsect)       /* Fill sector cache if needed */
        {
#if !_FS_TINY
#if !_FS_READONLY

            if(fp->flag & FA__DIRTY)               /* Write-back dirty sector cache */
            {
                if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->flag &= ~FA__DIRTY;
            }

#endif

            if(disk_read(fp->fs->drv, fp->buf, nsect, 1) != RES_OK)     /* Fill sector cache */
            {
                ABORT(fp->fs, FR_DISK_ERR);
            }

#endif
            fp->dsect = nsect;
        }

#if !_FS_READONLY

        if(fp->fptr > fp->fsize)               /* Set file change flag if the file size is extended */
        {
            fp->fsize = fp->fptr;
            fp->flag |= FA__WRITTEN;
        }

#endif
    }

    LEAVE_FF(fp->fs, res);
}



#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Create a Directory Object                                             */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir(
    DIR *dp,            /* Pointer to directory object to create */
    const TCHAR *path    /* Pointer to the directory path */
)
{
    FRESULT res;
    FATFS *fs;
    DEF_NAMEBUF;

    if(!dp)
    {
        return FR_INVALID_OBJECT;
    }

    /* Get logical drive number */
    res = find_volume(&fs, &path, 0);

    if(res == FR_OK)
    {
        dp->fs = fs;
        INIT_BUF(*dp);
        res = follow_path(dp, path);            /* Follow the path to the directory */
        FREE_BUF();

        if(res == FR_OK)                           /* Follow completed */
        {
            if(dp->dir)                           /* It is not the origin directory itself */
            {
                if(dp->dir[DIR_Attr] & AM_DIR)     /* The object is a sub directory */
                {
                    dp->sclust = ld_clust(fs, dp->dir);
                }
                else                            /* The object is a file */
                {
                    res = FR_NO_PATH;
                }
            }

            if(res == FR_OK)
            {
                dp->id = fs->id;
                res = dir_sdi(dp, 0);            /* Rewind directory */
#if _FS_LOCK

                if(res == FR_OK)
                {
                    if(dp->sclust)
                    {
                        dp->lockid = inc_lock(dp, 0);    /* Lock the sub directory */

                        if(!dp->lockid)
                        {
                            res = FR_TOO_MANY_OPEN_FILES;
                        }
                    }
                    else
                    {
                        dp->lockid = 0;    /* Root directory need not to be locked */
                    }
                }

#endif
            }
        }

        if(res == FR_NO_FILE)
        {
            res = FR_NO_PATH;
        }
    }

    if(res != FR_OK)
    {
        dp->fs = 0;    /* Invalidate the directory object if function faild */
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Close Directory                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_closedir(
    DIR *dp        /* Pointer to the directory object to be closed */
)
{
    FRESULT res;
    res = validate(dp);

    if(res == FR_OK)
    {
#if _FS_REENTRANT
        FATFS *fs = dp->fs;
#endif
#if _FS_LOCK

        if(dp->lockid)                 /* Decrement sub-directory open counter */
        {
            res = dec_lock(dp->lockid);
        }

        if(res == FR_OK)
#endif
            dp->fs = 0;                /* Invalidate directory object */

#if _FS_REENTRANT
        unlock_fs(fs, FR_OK);        /* Unlock volume */
#endif
    }

    return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entries in Sequence                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir(
    DIR *dp,            /* Pointer to the open directory object */
    FILINFO *fno        /* Pointer to file information to return */
)
{
    FRESULT res;
    DEF_NAMEBUF;
    res = validate(dp);                        /* Check validity of the object */

    if(res == FR_OK)
    {
        if(!fno)
        {
            res = dir_sdi(dp, 0);            /* Rewind the directory object */
        }
        else
        {
            INIT_BUF(*dp);
            res = dir_read(dp, 0);            /* Read an item */

            if(res == FR_NO_FILE)           /* Reached end of directory */
            {
                dp->sect = 0;
                res = FR_OK;
            }

            if(res == FR_OK)                   /* A valid entry is found */
            {
                get_fileinfo(dp, fno);        /* Get the object information */
                res = dir_next(dp, 0);        /* Increment index for next */

                if(res == FR_NO_FILE)
                {
                    dp->sect = 0;
                    res = FR_OK;
                }
            }

            FREE_BUF();
        }
    }

    LEAVE_FF(dp->fs, res);
}



#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat(
    const TCHAR *path,    /* Pointer to the file path */
    FILINFO *fno        /* Pointer to file information to return */
)
{
    FRESULT res;
    DIR dj;
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);    /* Follow the file path */

        if(res == FR_OK)                   /* Follow completed */
        {
            if(dj.dir)           /* Found an object */
            {
                if(fno)
                {
                    get_fileinfo(&dj, fno);
                }
            }
            else              /* It is root directory */
            {
                res = FR_INVALID_NAME;
            }
        }

        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree(
    const TCHAR *path,    /* Path name of the logical drive number */
    DWORD *nclst,        /* Pointer to a variable to return number of free clusters */
    FATFS **fatfs        /* Pointer to return pointer to corresponding file system object */
)
{
    FRESULT res;
    FATFS *fs;
    DWORD n, clst, sect, stat;
    UINT i;
    BYTE fat, *p;
    /* Get logical drive number */
    res = find_volume(fatfs, &path, 0);
    fs = *fatfs;

    if(res == FR_OK)
    {
        /* If free_clust is valid, return it without full cluster scan */
        if(fs->free_clust <= fs->n_fatent - 2)
        {
            *nclst = fs->free_clust;
        }
        else
        {
            /* Get number of free clusters */
            fat = fs->fs_type;
            n = 0;

            if(fat == FS_FAT12)
            {
                clst = 2;

                do
                {
                    stat = get_fat(fs, clst);

                    if(stat == 0xFFFFFFFF)
                    {
                        res = FR_DISK_ERR;
                        break;
                    }

                    if(stat == 1)
                    {
                        res = FR_INT_ERR;
                        break;
                    }

                    if(stat == 0)
                    {
                        n++;
                    }
                }
                while(++clst < fs->n_fatent);
            }
            else
            {
                clst = fs->n_fatent;
                sect = fs->fatbase;
                i = 0;
                p = 0;

                do
                {
                    if(!i)
                    {
                        res = move_window(fs, sect++);

                        if(res != FR_OK)
                        {
                            break;
                        }

                        p = fs->win;
                        i = SS(fs);
                    }

                    if(fat == FS_FAT16)
                    {
                        if(LD_WORD(p) == 0)
                        {
                            n++;
                        }

                        p += 2;
                        i -= 2;
                    }
                    else
                    {
                        if((LD_DWORD(p) & 0x0FFFFFFF) == 0)
                        {
                            n++;
                        }

                        p += 4;
                        i -= 4;
                    }
                }
                while(--clst);
            }

            fs->free_clust = n;
            fs->fsi_flag |= 1;
            *nclst = n;
        }
    }

    LEAVE_FF(fs, res);
}




/*-----------------------------------------------------------------------*/
/* Truncate File                                                         */
/*-----------------------------------------------------------------------*/

FRESULT f_truncate(
    FIL *fp        /* Pointer to the file object */
)
{
    FRESULT res;
    DWORD ncl;
    res = validate(fp);                        /* Check validity of the object */

    if(res == FR_OK)
    {
        if(fp->err)                           /* Check error */
        {
            res = (FRESULT)fp->err;
        }
        else
        {
            if(!(fp->flag & FA_WRITE))         /* Check access mode */
            {
                res = FR_DENIED;
            }
        }
    }

    if(res == FR_OK)
    {
        if(fp->fsize > fp->fptr)
        {
            fp->fsize = fp->fptr;    /* Set file size to current R/W point */
            fp->flag |= FA__WRITTEN;

            if(fp->fptr == 0)       /* When set file size to zero, remove entire cluster chain */
            {
                res = remove_chain(fp->fs, fp->sclust);
                fp->sclust = 0;
            }
            else                  /* When truncate a part of the file, remove remaining clusters */
            {
                ncl = get_fat(fp->fs, fp->clust);
                res = FR_OK;

                if(ncl == 0xFFFFFFFF)
                {
                    res = FR_DISK_ERR;
                }

                if(ncl == 1)
                {
                    res = FR_INT_ERR;
                }

                if(res == FR_OK && ncl < fp->fs->n_fatent)
                {
                    res = put_fat(fp->fs, fp->clust, 0x0FFFFFFF);

                    if(res == FR_OK)
                    {
                        res = remove_chain(fp->fs, ncl);
                    }
                }
            }

#if !_FS_TINY

            if(res == FR_OK && (fp->flag & FA__DIRTY))
            {
                if(disk_write(fp->fs->drv, fp->buf, fp->dsect, 1) != RES_OK)
                {
                    res = FR_DISK_ERR;
                }
                else
                {
                    fp->flag &= ~FA__DIRTY;
                }
            }

#endif
        }

        if(res != FR_OK)
        {
            fp->err = (FRESULT)res;
        }
    }

    LEAVE_FF(fp->fs, res);
}




/*-----------------------------------------------------------------------*/
/* Delete a File or Directory                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink(
    const TCHAR *path        /* Pointer to the file or directory path */
)
{
    FRESULT res;
    DIR dj, sdj;
    BYTE *dir;
    DWORD dclst = 0;
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);        /* Follow the file path */

        if(_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
        {
            res = FR_INVALID_NAME;    /* Cannot remove dot entry */
        }

#if _FS_LOCK

        if(res == FR_OK)
        {
            res = chk_lock(&dj, 2);    /* Cannot remove open object */
        }

#endif

        if(res == FR_OK)                       /* The object is accessible */
        {
            dir = dj.dir;

            if(!dir)
            {
                res = FR_INVALID_NAME;        /* Cannot remove the origin directory */
            }
            else
            {
                if(dir[DIR_Attr] & AM_RDO)
                {
                    res = FR_DENIED;    /* Cannot remove R/O object */
                }
            }

            if(res == FR_OK && (dir[DIR_Attr] & AM_DIR))       /* Is it a sub-dir? */
            {
                dclst = ld_clust(dj.fs, dir);

                if(!dclst)
                {
                    res = FR_INT_ERR;
                }
                else                      /* Make sure the sub-directory is empty */
                {
                    mem_cpy(&sdj, &dj, sizeof(DIR));
                    sdj.sclust = dclst;
                    res = dir_sdi(&sdj, 2);        /* Exclude dot entries */

                    if(res == FR_OK)
                    {
                        res = dir_read(&sdj, 0);    /* Read an item */

                        if(res == FR_OK         /* Not empty directory */
#if _FS_RPATH
                                || dclst == dj.fs->cdir    /* or current directory */
#endif
                          )
                        {
                            res = FR_DENIED;
                        }

                        if(res == FR_NO_FILE)
                        {
                            res = FR_OK;    /* It is empty */
                        }
                    }
                }
            }

            if(res == FR_OK)
            {
                res = dir_remove(&dj);        /* Remove the directory entry */

                if(res == FR_OK && dclst)     /* Remove the cluster chain if exist */
                {
                    res = remove_chain(dj.fs, dclst);
                }

                if(res == FR_OK)
                {
                    res = sync_fs(dj.fs);
                }
            }
        }

        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir(
    const TCHAR *path        /* Pointer to the directory path */
)
{
    FRESULT res;
    DIR dj;
    BYTE *dir, n;
    DWORD dsc, dcl, pcl, tm = GET_FATTIME();
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);            /* Follow the file path */

        if(res == FR_OK)
        {
            res = FR_EXIST;    /* Any object with same name is already existing */
        }

        if(_FS_RPATH && res == FR_NO_FILE && (dj.fn[NSFLAG] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }

        if(res == FR_NO_FILE)                   /* Can create a new directory */
        {
            dcl = create_chain(dj.fs, 0);        /* Allocate a cluster for the new directory table */
            res = FR_OK;

            if(dcl == 0)
            {
                res = FR_DENIED;    /* No space to allocate a new cluster */
            }

            if(dcl == 1)
            {
                res = FR_INT_ERR;
            }

            if(dcl == 0xFFFFFFFF)
            {
                res = FR_DISK_ERR;
            }

            if(res == FR_OK)                     /* Flush FAT */
            {
                res = sync_window(dj.fs);
            }

            if(res == FR_OK)                       /* Initialize the new directory table */
            {
                dsc = clust2sect(dj.fs, dcl);
                dir = dj.fs->win;
                mem_set(dir, 0, SS(dj.fs));
                mem_set(dir + DIR_Name, ' ', 11);    /* Create "." entry */
                dir[DIR_Name] = '.';
                dir[DIR_Attr] = AM_DIR;
                ST_DWORD(dir + DIR_WrtTime, tm);
                st_clust(dir, dcl);
                mem_cpy(dir + SZ_DIR, dir, SZ_DIR);     /* Create ".." entry */
                dir[SZ_DIR + 1] = '.';
                pcl = dj.sclust;

                if(dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
                {
                    pcl = 0;
                }

                st_clust(dir + SZ_DIR, pcl);

                for(n = dj.fs->csize; n; n--)       /* Write dot entries and clear following sectors */
                {
                    dj.fs->winsect = dsc++;
                    dj.fs->wflag = 1;
                    res = sync_window(dj.fs);

                    if(res != FR_OK)
                    {
                        break;
                    }

                    mem_set(dir, 0, SS(dj.fs));
                }
            }

            if(res == FR_OK)
            {
                res = dir_register(&dj);    /* Register the object to the directoy */
            }

            if(res != FR_OK)
            {
                remove_chain(dj.fs, dcl);            /* Could not register, remove cluster chain */
            }
            else
            {
                dir = dj.dir;
                dir[DIR_Attr] = AM_DIR;                /* Attribute */
                ST_DWORD(dir + DIR_WrtTime, tm);        /* Created time */
                st_clust(dir, dcl);                    /* Table start cluster */
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }

        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Attribute                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_chmod(
    const TCHAR *path,    /* Pointer to the file path */
    BYTE value,            /* Attribute bits */
    BYTE mask            /* Attribute mask to change */
)
{
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);        /* Follow the file path */
        FREE_BUF();

        if(_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }

        if(res == FR_OK)
        {
            dir = dj.dir;

            if(!dir)                           /* Is it a root directory? */
            {
                res = FR_INVALID_NAME;
            }
            else                          /* File or sub directory */
            {
                mask &= AM_RDO | AM_HID | AM_SYS | AM_ARC;    /* Valid attribute mask */
                dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask);    /* Apply attribute change */
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Rename File/Directory                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_rename(
    const TCHAR *path_old,    /* Pointer to the object to be renamed */
    const TCHAR *path_new    /* Pointer to the new name */
)
{
    FRESULT res;
    DIR djo, djn;
    BYTE buf[21], *dir;
    DWORD dw;
    DEF_NAMEBUF;
    /* Get logical drive number of the source object */
    res = find_volume(&djo.fs, &path_old, 1);

    if(res == FR_OK)
    {
        djn.fs = djo.fs;
        INIT_BUF(djo);
        res = follow_path(&djo, path_old);        /* Check old object */

        if(_FS_RPATH && res == FR_OK && (djo.fn[NSFLAG] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }

#if _FS_LOCK

        if(res == FR_OK)
        {
            res = chk_lock(&djo, 2);
        }

#endif

        if(res == FR_OK)                           /* Old object is found */
        {
            if(!djo.dir)                           /* Is root dir? */
            {
                res = FR_NO_FILE;
            }
            else
            {
                mem_cpy(buf, djo.dir + DIR_Attr, 21);        /* Save the object information except name */
                mem_cpy(&djn, &djo, sizeof(DIR));        /* Duplicate the directory object */

                if(get_ldnumber(&path_new) >= 0)         /* Snip drive number off and ignore it */
                {
                    res = follow_path(&djn, path_new);    /* and make sure if new object name is not conflicting */
                }
                else
                {
                    res = FR_INVALID_DRIVE;
                }

                if(res == FR_OK)
                {
                    res = FR_EXIST;    /* The new object name is already existing */
                }

                if(res == FR_NO_FILE)                    /* It is a valid path and no name collision */
                {
                    /* Start of critical section that any interruption can cause a cross-link */
                    res = dir_register(&djn);            /* Register the new entry */

                    if(res == FR_OK)
                    {
                        dir = djn.dir;                    /* Copy object information except name */
                        mem_cpy(dir + 13, buf + 2, 19);
                        dir[DIR_Attr] = buf[0] | AM_ARC;
                        djo.fs->wflag = 1;

                        if((dir[DIR_Attr] & AM_DIR) && djo.sclust != djn.sclust)       /* Update .. entry in the directory if needed */
                        {
                            dw = clust2sect(djo.fs, ld_clust(djo.fs, dir));

                            if(!dw)
                            {
                                res = FR_INT_ERR;
                            }
                            else
                            {
                                res = move_window(djo.fs, dw);
                                dir = djo.fs->win + SZ_DIR;    /* .. entry */

                                if(res == FR_OK && dir[1] == '.')
                                {
                                    st_clust(dir, djn.sclust);
                                    djo.fs->wflag = 1;
                                }
                            }
                        }

                        if(res == FR_OK)
                        {
                            res = dir_remove(&djo);        /* Remove old entry */

                            if(res == FR_OK)
                            {
                                res = sync_fs(djo.fs);
                            }
                        }
                    }

                    /* End of critical section */
                }
            }
        }

        FREE_BUF();
    }

    LEAVE_FF(djo.fs, res);
}




/*-----------------------------------------------------------------------*/
/* Change Timestamp                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_utime(
    const TCHAR *path,    /* Pointer to the file/directory name */
    const FILINFO *fno    /* Pointer to the time stamp to be set */
)
{
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);

    if(res == FR_OK)
    {
        INIT_BUF(dj);
        res = follow_path(&dj, path);    /* Follow the file path */
        FREE_BUF();

        if(_FS_RPATH && res == FR_OK && (dj.fn[NSFLAG] & NS_DOT))
        {
            res = FR_INVALID_NAME;
        }

        if(res == FR_OK)
        {
            dir = dj.dir;

            if(!dir)                       /* Root directory */
            {
                res = FR_INVALID_NAME;
            }
            else                      /* File or sub-directory */
            {
                ST_WORD(dir + DIR_WrtTime, fno->ftime);
                ST_WORD(dir + DIR_WrtDate, fno->fdate);
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _FS_MINIMIZE == 0 */
#endif /* _FS_MINIMIZE <= 1 */
#endif /* _FS_MINIMIZE <= 2 */



#if _USE_LABEL
/*-----------------------------------------------------------------------*/
/* Get volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_getlabel(
    const TCHAR *path,    /* Path name of the logical drive number */
    TCHAR *label,        /* Pointer to a buffer to return the volume label */
    DWORD *vsn            /* Pointer to a variable to return the volume serial number */
)
{
    FRESULT res;
    DIR dj;
    UINT i, j;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);

    /* Get volume label */
    if(res == FR_OK && label)
    {
        dj.sclust = 0;                    /* Open root directory */
        res = dir_sdi(&dj, 0);

        if(res == FR_OK)
        {
            res = dir_read(&dj, 1);        /* Get an entry with AM_VOL */

            if(res == FR_OK)               /* A volume label is exist */
            {
#if _USE_LFN && _LFN_UNICODE
                WCHAR w;
                i = j = 0;

                do
                {
                    w = (i < 11) ? dj.dir[i++] : ' ';

                    if(IsDBCS1(w) && i < 11 && IsDBCS2(dj.dir[i]))
                    {
                        w = w << 8 | dj.dir[i++];
                    }

                    label[j++] = ff_convert(w, 1);    /* OEM -> Unicode */
                }
                while(j < 11);

#else
                mem_cpy(label, dj.dir, 11);
#endif
                j = 11;

                do
                {
                    label[j] = 0;

                    if(!j)
                    {
                        break;
                    }
                }
                while(label[--j] == ' ');
            }

            if(res == FR_NO_FILE)       /* No label, return nul string */
            {
                label[0] = 0;
                res = FR_OK;
            }
        }
    }

    /* Get volume serial number */
    if(res == FR_OK && vsn)
    {
        res = move_window(dj.fs, dj.fs->volbase);

        if(res == FR_OK)
        {
            i = dj.fs->fs_type == FS_FAT32 ? BS_VolID32 : BS_VolID;
            *vsn = LD_DWORD(&dj.fs->win[i]);
        }
    }

    LEAVE_FF(dj.fs, res);
}



#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Set volume label                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_setlabel(
    const TCHAR *label    /* Pointer to the volume label to set */
)
{
    FRESULT res;
    DIR dj;
    BYTE vn[11];
    UINT i, j, sl;
    WCHAR w;
    DWORD tm;
    /* Get logical drive number */
    res = find_volume(&dj.fs, &label, 1);

    if(res)
    {
        LEAVE_FF(dj.fs, res);
    }

    /* Create a volume label in directory form */
    vn[0] = 0;

    for(sl = 0; label[sl]; sl++);                 /* Get name length */

    for(; sl && label[sl - 1] == ' '; sl--);     /* Remove trailing spaces */

    if(sl)       /* Create volume label in directory form */
    {
        i = j = 0;

        do
        {
#if _USE_LFN && _LFN_UNICODE
            w = ff_convert(ff_wtoupper(label[i++]), 0);
#else
            w = (BYTE)label[i++];

            if(IsDBCS1(w))
            {
                w = (j < 10 && i < sl && IsDBCS2(label[i])) ? w << 8 | (BYTE)label[i++] : 0;
            }

#if _USE_LFN
            w = ff_convert(ff_wtoupper(ff_convert(w, 1)), 0);
#else

            if(IsLower(w))
            {
                w -= 0x20;    /* To upper ASCII characters */
            }

#ifdef _EXCVT

            if(w >= 0x80)
            {
                w = ExCvt[w - 0x80];    /* To upper extended characters (SBCS cfg) */
            }

#else

            if(!_DF1S && w >= 0x80)
            {
                w = 0;    /* Reject extended characters (ASCII cfg) */
            }

#endif
#endif
#endif

            if(!w || chk_chr("\"*+,.:;<=>\?[]|\x7F", w) || j >= (UINT)((w >= 0x100) ? 10 : 11))  /* Reject invalid characters for volume label */
            {
                LEAVE_FF(dj.fs, FR_INVALID_NAME);
            }

            if(w >= 0x100)
            {
                vn[j++] = (BYTE)(w >> 8);
            }

            vn[j++] = (BYTE)w;
        }
        while(i < sl);

        while(j < 11)
        {
            vn[j++] = ' ';
        }
    }

    /* Set volume label */
    dj.sclust = 0;                    /* Open root directory */
    res = dir_sdi(&dj, 0);

    if(res == FR_OK)
    {
        res = dir_read(&dj, 1);        /* Get an entry with AM_VOL */

        if(res == FR_OK)               /* A volume label is found */
        {
            if(vn[0])
            {
                mem_cpy(dj.dir, vn, 11);    /* Change the volume label name */
                tm = GET_FATTIME();
                ST_DWORD(dj.dir + DIR_WrtTime, tm);
            }
            else
            {
                dj.dir[0] = DDE;            /* Remove the volume label */
            }

            dj.fs->wflag = 1;
            res = sync_fs(dj.fs);
        }
        else                      /* No volume label is found or error */
        {
            if(res == FR_NO_FILE)
            {
                res = FR_OK;

                if(vn[0])                   /* Create volume label as new */
                {
                    res = dir_alloc(&dj, 1);    /* Allocate an entry for volume label */

                    if(res == FR_OK)
                    {
                        mem_set(dj.dir, 0, SZ_DIR);    /* Set volume label */
                        mem_cpy(dj.dir, vn, 11);
                        dj.dir[DIR_Attr] = AM_VOL;
                        tm = GET_FATTIME();
                        ST_DWORD(dj.dir + DIR_WrtTime, tm);
                        dj.fs->wflag = 1;
                        res = sync_fs(dj.fs);
                    }
                }
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}

#endif /* !_FS_READONLY */
#endif /* _USE_LABEL */



/*-----------------------------------------------------------------------*/
/* Forward data to the stream directly (available on only tiny cfg)      */
/*-----------------------------------------------------------------------*/
#if _USE_FORWARD && _FS_TINY

FRESULT f_forward(
    FIL *fp,                         /* Pointer to the file object */
    UINT(*func)(const BYTE *, UINT),   /* Pointer to the streaming function */
    UINT btf,                        /* Number of bytes to forward */
    UINT *bf                        /* Pointer to number of bytes forwarded */
)
{
    FRESULT res;
    DWORD remain, clst, sect;
    UINT rcnt;
    BYTE csect;
    *bf = 0;    /* Clear transfer byte counter */
    res = validate(fp);                                /* Check validity of the object */

    if(res != FR_OK)
    {
        LEAVE_FF(fp->fs, res);
    }

    if(fp->err)                                     /* Check error */
    {
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    }

    if(!(fp->flag & FA_READ))                         /* Check access mode */
    {
        LEAVE_FF(fp->fs, FR_DENIED);
    }

    remain = fp->fsize - fp->fptr;

    if(btf > remain)
    {
        btf = (UINT)remain;    /* Truncate btf by remaining bytes */
    }

    for(;  btf && (*func)(0, 0);                     /* Repeat until all data transferred or stream becomes busy */
            fp->fptr += rcnt, *bf += rcnt, btf -= rcnt)
    {
        csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */

        if((fp->fptr % SS(fp->fs)) == 0)               /* On the sector boundary? */
        {
            if(!csect)                               /* On the cluster boundary? */
            {
                clst = (fp->fptr == 0) ?            /* On the top of the file? */
                       fp->sclust : get_fat(fp->fs, fp->clust);

                if(clst <= 1)
                {
                    ABORT(fp->fs, FR_INT_ERR);
                }

                if(clst == 0xFFFFFFFF)
                {
                    ABORT(fp->fs, FR_DISK_ERR);
                }

                fp->clust = clst;                    /* Update current cluster */
            }
        }

        sect = clust2sect(fp->fs, fp->clust);        /* Get current data sector */

        if(!sect)
        {
            ABORT(fp->fs, FR_INT_ERR);
        }

        sect += csect;

        if(move_window(fp->fs, sect) != FR_OK)         /* Move sector window */
        {
            ABORT(fp->fs, FR_DISK_ERR);
        }

        fp->dsect = sect;
        rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs));    /* Forward data from sector window */

        if(rcnt > btf)
        {
            rcnt = btf;
        }

        rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);

        if(!rcnt)
        {
            ABORT(fp->fs, FR_INT_ERR);
        }
    }

    LEAVE_FF(fp->fs, FR_OK);
}
#endif /* _USE_FORWARD */



#if _USE_MKFS && !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Create File System on the Drive                                       */
/*-----------------------------------------------------------------------*/
#define N_ROOTDIR    512        /* Number of root directory entries for FAT12/16 */
#define N_FATS        1        /* Number of FATs (1 or 2) */


FRESULT f_mkfs(
    const TCHAR *path,    /* Logical drive number */
    BYTE sfd,            /* Partitioning rule 0:FDISK, 1:SFD */
    UINT au                /* Size of allocation unit in unit of byte or sector */
)
{
    static const WORD vst[] = { 1024,   512,  256,  128,   64,    32,   16,    8,    4,    2,   0 };
    static const WORD cst[] = { 32768, 16384, 8192, 4096, 2048, 16384, 8192, 4096, 2048, 1024, 512 };
    int vol;
    BYTE fmt, md, sys, *tbl, pdrv, part;
    DWORD n_clst, vs, n, wsect;
    UINT i;
    DWORD b_vol, b_fat, b_dir, b_data;    /* LBA */
    DWORD n_vol, n_rsv, n_fat, n_dir;    /* Size */
    FATFS *fs;
    DSTATUS stat;

    /* Check mounted drive and clear work area */
    if(sfd > 1)
    {
        return FR_INVALID_PARAMETER;
    }

    vol = get_ldnumber(&path);

    if(vol < 0)
    {
        return FR_INVALID_DRIVE;
    }

    fs = FatFs[vol];

    if(!fs)
    {
        return FR_NOT_ENABLED;
    }

    fs->fs_type = 0;
    pdrv = LD2PD(vol);    /* Physical drive */
    part = LD2PT(vol);    /* Partition (0:auto detect, 1-4:get from partition table)*/
    /* Get disk statics */
    stat = disk_initialize(pdrv);

    if(stat & STA_NOINIT)
    {
        return FR_NOT_READY;
    }

    if(stat & STA_PROTECT)
    {
        return FR_WRITE_PROTECTED;
    }

#if _MAX_SS != _MIN_SS        /* Get disk sector size */

    if(disk_ioctl(pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS || SS(fs) < _MIN_SS)
    {
        return FR_DISK_ERR;
    }

#endif

    if(_MULTI_PARTITION && part)
    {
        /* Get partition information from partition table in the MBR */
        if(disk_read(pdrv, fs->win, 0, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }

        if(LD_WORD(fs->win + BS_55AA) != 0xAA55)
        {
            return FR_MKFS_ABORTED;
        }

        tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];

        if(!tbl[4])
        {
            return FR_MKFS_ABORTED;    /* No partition? */
        }

        b_vol = LD_DWORD(tbl + 8);    /* Volume start sector */
        n_vol = LD_DWORD(tbl + 12);    /* Volume size */
    }
    else
    {
        /* Create a partition in this function */
        if(disk_ioctl(pdrv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
        {
            return FR_DISK_ERR;
        }

        b_vol = (sfd) ? 0 : 63;        /* Volume start sector */
        n_vol -= b_vol;                /* Volume size */
    }

    if(au & (au - 1))
    {
        au = 0;
    }

    if(!au)                           /* AU auto selection */
    {
        vs = n_vol / (2000 / (SS(fs) / 512));

        for(i = 0; vs < vst[i]; i++);

        au = cst[i];
    }

    if(au >= _MIN_SS)
    {
        au /= SS(fs);    /* Number of sectors per cluster */
    }

    if(!au)
    {
        au = 1;
    }

    if(au > 128)
    {
        au = 128;
    }

    /* Pre-compute number of clusters and FAT sub-type */
    n_clst = n_vol / au;
    fmt = FS_FAT12;

    if(n_clst >= MIN_FAT16)
    {
        fmt = FS_FAT16;
    }

    if(n_clst >= MIN_FAT32)
    {
        fmt = FS_FAT32;
    }

    /* Determine offset and size of FAT structure */
    if(fmt == FS_FAT32)
    {
        n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
        n_rsv = 32;
        n_dir = 0;
    }
    else
    {
        n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
        n_fat = (n_fat + SS(fs) - 1) / SS(fs);
        n_rsv = 1;
        n_dir = (DWORD)N_ROOTDIR * SZ_DIR / SS(fs);
    }

    b_fat = b_vol + n_rsv;                /* FAT area start sector */
    b_dir = b_fat + n_fat * N_FATS;        /* Directory area start sector */
    b_data = b_dir + n_dir;                /* Data area start sector */

    if(n_vol < b_data + au - b_vol)
    {
        return FR_MKFS_ABORTED;    /* Too small volume */
    }

    /* Align data start sector to erase block boundary (for flash memory media) */
    if(disk_ioctl(pdrv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768)
    {
        n = 1;
    }

    n = (b_data + n - 1) & ~(n - 1);    /* Next nearest erase block from current data start */
    n = (n - b_data) / N_FATS;

    if(fmt == FS_FAT32)           /* FAT32: Move FAT offset */
    {
        n_rsv += n;
        b_fat += n;
    }
    else                      /* FAT12/16: Expand FAT size */
    {
        n_fat += n;
    }

    /* Determine number of clusters and final check of validity of the FAT sub-type */
    n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;

    if((fmt == FS_FAT16 && n_clst < MIN_FAT16)
            || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
    {
        return FR_MKFS_ABORTED;
    }

    /* Determine system ID in the partition table */
    if(fmt == FS_FAT32)
    {
        sys = 0x0C;        /* FAT32X */
    }
    else
    {
        if(fmt == FS_FAT12 && n_vol < 0x10000)
        {
            sys = 0x01;    /* FAT12(<65536) */
        }
        else
        {
            sys = (n_vol < 0x10000) ? 0x04 : 0x06;    /* FAT16(<65536) : FAT12/16(>=65536) */
        }
    }

    if(_MULTI_PARTITION && part)
    {
        /* Update system ID in the partition table */
        tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
        tbl[4] = sys;

        if(disk_write(pdrv, fs->win, 0, 1) != RES_OK)     /* Write it to teh MBR */
        {
            return FR_DISK_ERR;
        }

        md = 0xF8;
    }
    else
    {
        if(sfd)       /* No partition table (SFD) */
        {
            md = 0xF0;
        }
        else      /* Create partition table (FDISK) */
        {
            mem_set(fs->win, 0, SS(fs));
            tbl = fs->win + MBR_Table;    /* Create partition table for single partition in the drive */
            tbl[1] = 1;                        /* Partition start head */
            tbl[2] = 1;                        /* Partition start sector */
            tbl[3] = 0;                        /* Partition start cylinder */
            tbl[4] = sys;                    /* System type */
            tbl[5] = 254;                    /* Partition end head */
            n = (b_vol + n_vol) / 63 / 255;
            tbl[6] = (BYTE)(n >> 2 | 63);    /* Partition end sector */
            tbl[7] = (BYTE)n;                /* End cylinder */
            ST_DWORD(tbl + 8, 63);            /* Partition start in LBA */
            ST_DWORD(tbl + 12, n_vol);        /* Partition size in LBA */
            ST_WORD(fs->win + BS_55AA, 0xAA55);    /* MBR signature */

            if(disk_write(pdrv, fs->win, 0, 1) != RES_OK)     /* Write it to the MBR */
            {
                return FR_DISK_ERR;
            }

            md = 0xF8;
        }
    }

    /* Create BPB in the VBR */
    tbl = fs->win;                            /* Clear sector */
    mem_set(tbl, 0, SS(fs));
    mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code, OEM name */
    i = SS(fs);                                /* Sector size */
    ST_WORD(tbl + BPB_BytsPerSec, i);
    tbl[BPB_SecPerClus] = (BYTE)au;            /* Sectors per cluster */
    ST_WORD(tbl + BPB_RsvdSecCnt, n_rsv);        /* Reserved sectors */
    tbl[BPB_NumFATs] = N_FATS;                /* Number of FATs */
    i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;    /* Number of root directory entries */
    ST_WORD(tbl + BPB_RootEntCnt, i);

    if(n_vol < 0x10000)                       /* Number of total sectors */
    {
        ST_WORD(tbl + BPB_TotSec16, n_vol);
    }
    else
    {
        ST_DWORD(tbl + BPB_TotSec32, n_vol);
    }

    tbl[BPB_Media] = md;                    /* Media descriptor */
    ST_WORD(tbl + BPB_SecPerTrk, 63);            /* Number of sectors per track */
    ST_WORD(tbl + BPB_NumHeads, 255);            /* Number of heads */
    ST_DWORD(tbl + BPB_HiddSec, b_vol);        /* Hidden sectors */
    n = GET_FATTIME();                        /* Use current time as VSN */

    if(fmt == FS_FAT32)
    {
        ST_DWORD(tbl + BS_VolID32, n);        /* VSN */
        ST_DWORD(tbl + BPB_FATSz32, n_fat);    /* Number of sectors per FAT */
        ST_DWORD(tbl + BPB_RootClus, 2);        /* Root directory start cluster (2) */
        ST_WORD(tbl + BPB_FSInfo, 1);            /* FSINFO record offset (VBR+1) */
        ST_WORD(tbl + BPB_BkBootSec, 6);        /* Backup boot record offset (VBR+6) */
        tbl[BS_DrvNum32] = 0x80;            /* Drive number */
        tbl[BS_BootSig32] = 0x29;            /* Extended boot signature */
        mem_cpy(tbl + BS_VolLab32, "NO NAME    " "FAT32   ", 19);    /* Volume label, FAT signature */
    }
    else
    {
        ST_DWORD(tbl + BS_VolID, n);            /* VSN */
        ST_WORD(tbl + BPB_FATSz16, n_fat);    /* Number of sectors per FAT */
        tbl[BS_DrvNum] = 0x80;                /* Drive number */
        tbl[BS_BootSig] = 0x29;                /* Extended boot signature */
        mem_cpy(tbl + BS_VolLab, "NO NAME    " "FAT     ", 19);    /* Volume label, FAT signature */
    }

    ST_WORD(tbl + BS_55AA, 0xAA55);            /* Signature (Offset is fixed here regardless of sector size) */

    if(disk_write(pdrv, tbl, b_vol, 1) != RES_OK)     /* Write it to the VBR sector */
    {
        return FR_DISK_ERR;
    }

    if(fmt == FS_FAT32)                     /* Write backup VBR if needed (VBR+6) */
    {
        disk_write(pdrv, tbl, b_vol + 6, 1);
    }

    /* Initialize FAT area */
    wsect = b_fat;

    for(i = 0; i < N_FATS; i++)           /* Initialize each FAT copy */
    {
        mem_set(tbl, 0, SS(fs));            /* 1st sector of the FAT  */
        n = md;                                /* Media descriptor byte */

        if(fmt != FS_FAT32)
        {
            n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
            ST_DWORD(tbl + 0, n);                /* Reserve cluster #0-1 (FAT12/16) */
        }
        else
        {
            n |= 0xFFFFFF00;
            ST_DWORD(tbl + 0, n);                /* Reserve cluster #0-1 (FAT32) */
            ST_DWORD(tbl + 4, 0xFFFFFFFF);
            ST_DWORD(tbl + 8, 0x0FFFFFFF);    /* Reserve cluster #2 for root directory */
        }

        if(disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }

        mem_set(tbl, 0, SS(fs));            /* Fill following FAT entries with zero */

        for(n = 1; n < n_fat; n++)           /* This loop may take a time on FAT32 volume due to many single sector writes */
        {
            if(disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
            {
                return FR_DISK_ERR;
            }
        }
    }

    /* Initialize root directory */
    i = (fmt == FS_FAT32) ? au : (UINT)n_dir;

    do
    {
        if(disk_write(pdrv, tbl, wsect++, 1) != RES_OK)
        {
            return FR_DISK_ERR;
        }
    }
    while(--i);

#if _USE_TRIM    /* Erase data area if needed */
    {
        DWORD eb[2];
        eb[0] = wsect;
        eb[1] = wsect + (n_clst - ((fmt == FS_FAT32) ? 1 : 0)) * au - 1;
        disk_ioctl(pdrv, CTRL_TRIM, eb);
    }
#endif

    /* Create FSINFO if needed */
    if(fmt == FS_FAT32)
    {
        ST_DWORD(tbl + FSI_LeadSig, 0x41615252);
        ST_DWORD(tbl + FSI_StrucSig, 0x61417272);
        ST_DWORD(tbl + FSI_Free_Count, n_clst - 1);    /* Number of free clusters */
        ST_DWORD(tbl + FSI_Nxt_Free, 2);                /* Last allocated cluster# */
        ST_WORD(tbl + BS_55AA, 0xAA55);
        disk_write(pdrv, tbl, b_vol + 1, 1);    /* Write original (VBR+1) */
        disk_write(pdrv, tbl, b_vol + 7, 1);    /* Write backup (VBR+7) */
    }

    return (disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
}



#if _MULTI_PARTITION
/*-----------------------------------------------------------------------*/
/* Divide Physical Drive                                                 */
/*-----------------------------------------------------------------------*/

FRESULT f_fdisk(
    BYTE pdrv,            /* Physical drive number */
    const DWORD szt[],    /* Pointer to the size table for each partitions */
    void *work            /* Pointer to the working buffer */
)
{
    UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
    BYTE s_hd, e_hd, *p, *buf = (BYTE *)work;
    DSTATUS stat;
    DWORD sz_disk, sz_part, s_part;
    stat = disk_initialize(pdrv);

    if(stat & STA_NOINIT)
    {
        return FR_NOT_READY;
    }

    if(stat & STA_PROTECT)
    {
        return FR_WRITE_PROTECTED;
    }

    if(disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk))
    {
        return FR_DISK_ERR;
    }

    /* Determine CHS in the table regardless of the drive geometry */
    for(n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2);

    if(n == 256)
    {
        n--;
    }

    e_hd = n - 1;
    sz_cyl = 63 * n;
    tot_cyl = sz_disk / sz_cyl;
    /* Create partition table */
    mem_set(buf, 0, _MAX_SS);
    p = buf + MBR_Table;
    b_cyl = 0;

    for(i = 0; i < 4; i++, p += SZ_PTE)
    {
        p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;

        if(!p_cyl)
        {
            continue;
        }

        s_part = (DWORD)sz_cyl * b_cyl;
        sz_part = (DWORD)sz_cyl * p_cyl;

        if(i == 0)       /* Exclude first track of cylinder 0 */
        {
            s_hd = 1;
            s_part += 63;
            sz_part -= 63;
        }
        else
        {
            s_hd = 0;
        }

        e_cyl = b_cyl + p_cyl - 1;

        if(e_cyl >= tot_cyl)
        {
            return FR_INVALID_PARAMETER;
        }

        /* Set partition table */
        p[1] = s_hd;                        /* Start head */
        p[2] = (BYTE)((b_cyl >> 2) + 1);    /* Start sector */
        p[3] = (BYTE)b_cyl;                    /* Start cylinder */
        p[4] = 0x06;                        /* System type (temporary setting) */
        p[5] = e_hd;                        /* End head */
        p[6] = (BYTE)((e_cyl >> 2) + 63);    /* End sector */
        p[7] = (BYTE)e_cyl;                    /* End cylinder */
        ST_DWORD(p + 8, s_part);            /* Start sector in LBA */
        ST_DWORD(p + 12, sz_part);            /* Partition size */
        /* Next partition */
        b_cyl += p_cyl;
    }

    ST_WORD(p, 0xAA55);
    /* Write it to the MBR */
    return (disk_write(pdrv, buf, 0, 1) != RES_OK || disk_ioctl(pdrv, CTRL_SYNC, 0) != RES_OK) ? FR_DISK_ERR : FR_OK;
}


#endif /* _MULTI_PARTITION */
#endif /* _USE_MKFS && !_FS_READONLY */




#if _USE_STRFUNC
/*-----------------------------------------------------------------------*/
/* Get a string from the file                                            */
/*-----------------------------------------------------------------------*/

TCHAR *f_gets(
    TCHAR *buff,    /* Pointer to the string buffer to read */
    int len,        /* Size of string buffer (characters) */
    FIL *fp            /* Pointer to the file object */
)
{
    int n = 0;
    TCHAR c, *p = buff;
    BYTE s[2];
    UINT rc;

    while(n < len - 1)       /* Read characters until buffer gets filled */
    {
#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3        /* Read a character in UTF-8 */
        f_read(fp, s, 1, &rc);

        if(rc != 1)
        {
            break;
        }

        c = s[0];

        if(c >= 0x80)
        {
            if(c < 0xC0)
            {
                continue;    /* Skip stray trailer */
            }

            if(c < 0xE0)               /* Two-byte sequence */
            {
                f_read(fp, s, 1, &rc);

                if(rc != 1)
                {
                    break;
                }

                c = (c & 0x1F) << 6 | (s[0] & 0x3F);

                if(c < 0x80)
                {
                    c = '?';
                }
            }
            else
            {
                if(c < 0xF0)           /* Three-byte sequence */
                {
                    f_read(fp, s, 2, &rc);

                    if(rc != 2)
                    {
                        break;
                    }

                    c = c << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);

                    if(c < 0x800)
                    {
                        c = '?';
                    }
                }
                else              /* Reject four-byte sequence */
                {
                    c = '?';
                }
            }
        }

#elif _STRF_ENCODE == 2        /* Read a character in UTF-16BE */
        f_read(fp, s, 2, &rc);

        if(rc != 2)
        {
            break;
        }

        c = s[1] + (s[0] << 8);
#elif _STRF_ENCODE == 1        /* Read a character in UTF-16LE */
        f_read(fp, s, 2, &rc);

        if(rc != 2)
        {
            break;
        }

        c = s[0] + (s[1] << 8);
#else                        /* Read a character in ANSI/OEM */
        f_read(fp, s, 1, &rc);

        if(rc != 1)
        {
            break;
        }

        c = s[0];

        if(IsDBCS1(c))
        {
            f_read(fp, s, 1, &rc);

            if(rc != 1)
            {
                break;
            }

            c = (c << 8) + s[0];
        }

        c = ff_convert(c, 1);    /* OEM -> Unicode */

        if(!c)
        {
            c = '?';
        }

#endif
#else                        /* Read a character without conversion */
        f_read(fp, s, 1, &rc);

        if(rc != 1)
        {
            break;
        }

        c = s[0];
#endif

        if(_USE_STRFUNC == 2 && c == '\r')
        {
            continue;    /* Strip '\r' */
        }

        *p++ = c;
        n++;

        if(c == '\n')
        {
            break;    /* Break on EOL */
        }
    }

    *p = 0;
    return n ? buff : 0;            /* When no data read (eof or error), return with error. */
}



#if !_FS_READONLY
#include <stdarg.h>
/*-----------------------------------------------------------------------*/
/* Put a character to the file                                           */
/*-----------------------------------------------------------------------*/

typedef struct
{
    FIL *fp;
    int idx, nchr;
    BYTE buf[64];
} putbuff;


static
void putc_bfd(
    putbuff *pb,
    TCHAR c
)
{
    UINT bw;
    int i;

    if(_USE_STRFUNC == 2 && c == '\n')      /* LF -> CRLF conversion */
    {
        putc_bfd(pb, '\r');
    }

    i = pb->idx;    /* Buffer write index (-1:error) */

    if(i < 0)
    {
        return;
    }

#if _USE_LFN && _LFN_UNICODE
#if _STRF_ENCODE == 3            /* Write a character in UTF-8 */

    if(c < 0x80)                   /* 7-bit */
    {
        pb->buf[i++] = (BYTE)c;
    }
    else
    {
        if(c < 0x800)           /* 11-bit */
        {
            pb->buf[i++] = (BYTE)(0xC0 | c >> 6);
        }
        else                  /* 16-bit */
        {
            pb->buf[i++] = (BYTE)(0xE0 | c >> 12);
            pb->buf[i++] = (BYTE)(0x80 | (c >> 6 & 0x3F));
        }

        pb->buf[i++] = (BYTE)(0x80 | (c & 0x3F));
    }

#elif _STRF_ENCODE == 2            /* Write a character in UTF-16BE */
    pb->buf[i++] = (BYTE)(c >> 8);
    pb->buf[i++] = (BYTE)c;
#elif _STRF_ENCODE == 1            /* Write a character in UTF-16LE */
    pb->buf[i++] = (BYTE)c;
    pb->buf[i++] = (BYTE)(c >> 8);
#else                            /* Write a character in ANSI/OEM */
    c = ff_convert(c, 0);    /* Unicode -> OEM */

    if(!c)
    {
        c = '?';
    }

    if(c >= 0x100)
    {
        pb->buf[i++] = (BYTE)(c >> 8);
    }

    pb->buf[i++] = (BYTE)c;
#endif
#else                            /* Write a character without conversion */
    pb->buf[i++] = (BYTE)c;
#endif

    if(i >= (int)(sizeof pb->buf) - 3)       /* Write buffered characters to the file */
    {
        f_write(pb->fp, pb->buf, (UINT)i, &bw);
        i = (bw == (UINT)i) ? 0 : -1;
    }

    pb->idx = i;
    pb->nchr++;
}



int f_putc(
    TCHAR c,    /* A character to be output */
    FIL *fp        /* Pointer to the file object */
)
{
    putbuff pb;
    UINT nw;
    pb.fp = fp;            /* Initialize output buffer */
    pb.nchr = pb.idx = 0;
    putc_bfd(&pb, c);    /* Put a character */

    if(pb.idx >= 0     /* Flush buffered characters to the file */
            && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
            && (UINT)pb.idx == nw)
    {
        return pb.nchr;
    }

    return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a string to the file                                              */
/*-----------------------------------------------------------------------*/

int f_puts(
    const TCHAR *str,    /* Pointer to the string to be output */
    FIL *fp                /* Pointer to the file object */
)
{
    putbuff pb;
    UINT nw;
    pb.fp = fp;                /* Initialize output buffer */
    pb.nchr = pb.idx = 0;

    while(*str)             /* Put the string */
    {
        putc_bfd(&pb, *str++);
    }

    if(pb.idx >= 0         /* Flush buffered characters to the file */
            && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
            && (UINT)pb.idx == nw)
    {
        return pb.nchr;
    }

    return EOF;
}




/*-----------------------------------------------------------------------*/
/* Put a formatted string to the file                                    */
/*-----------------------------------------------------------------------*/

int f_printf(
    FIL *fp,            /* Pointer to the file object */
    const TCHAR *fmt,    /* Pointer to the format string */
    ...                    /* Optional arguments... */
)
{
    va_list arp;
    BYTE f, r;
    UINT nw, i, j, w;
    DWORD v;
    TCHAR c, d, s[16], *p;
    putbuff pb;
    pb.fp = fp;                /* Initialize output buffer */
    pb.nchr = pb.idx = 0;
    va_start(arp, fmt);

    for(;;)
    {
        c = *fmt++;

        if(c == 0)
        {
            break;    /* End of string */
        }

        if(c != '%')                   /* Non escape character */
        {
            putc_bfd(&pb, c);
            continue;
        }

        w = f = 0;
        c = *fmt++;

        if(c == '0')                   /* Flag: '0' padding */
        {
            f = 1;
            c = *fmt++;
        }
        else
        {
            if(c == '-')               /* Flag: left justified */
            {
                f = 2;
                c = *fmt++;
            }
        }

        while(IsDigit(c))           /* Precision */
        {
            w = w * 10 + c - '0';
            c = *fmt++;
        }

        if(c == 'l' || c == 'L')       /* Prefix: Size is long int */
        {
            f |= 4;
            c = *fmt++;
        }

        if(!c)
        {
            break;
        }

        d = c;

        if(IsLower(d))
        {
            d -= 0x20;
        }

        switch(d)                   /* Type is... */
        {
            case 'S':                    /* String */
                p = va_arg(arp, TCHAR *);

                for(j = 0; p[j]; j++);

                if(!(f & 2))
                {
                    while(j++ < w)
                    {
                        putc_bfd(&pb, ' ');
                    }
                }

                while(*p)
                {
                    putc_bfd(&pb, *p++);
                }

                while(j++ < w)
                {
                    putc_bfd(&pb, ' ');
                }

                continue;

            case 'C':                    /* Character */
                putc_bfd(&pb, (TCHAR)va_arg(arp, int));
                continue;

            case 'B':                    /* Binary */
                r = 2;
                break;

            case 'O':                    /* Octal */
                r = 8;
                break;

            case 'D':                    /* Signed decimal */
            case 'U':                    /* Unsigned decimal */
                r = 10;
                break;

            case 'X':                    /* Hexdecimal */
                r = 16;
                break;

            default:                    /* Unknown type (pass-through) */
                putc_bfd(&pb, c);
                continue;
        }

        /* Get an argument and put it in numeral */
        v = (f & 4) ? (DWORD)va_arg(arp, long) : ((d == 'D') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int));

        if(d == 'D' && (v & 0x80000000))
        {
            v = 0 - v;
            f |= 8;
        }

        i = 0;

        do
        {
            d = (TCHAR)(v % r);
            v /= r;

            if(d > 9)
            {
                d += (c == 'x') ? 0x27 : 0x07;
            }

            s[i++] = d + '0';
        }
        while(v && i < sizeof s / sizeof s[0]);

        if(f & 8)
        {
            s[i++] = '-';
        }

        j = i;
        d = (f & 1) ? '0' : ' ';

        while(!(f & 2) && j++ < w)
        {
            putc_bfd(&pb, d);
        }

        do
        {
            putc_bfd(&pb, s[--i]);
        }
        while(i);

        while(j++ < w)
        {
            putc_bfd(&pb, d);
        }
    }

    va_end(arp);

    if(pb.idx >= 0         /* Flush buffered characters to the file */
            && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
            && (UINT)pb.idx == nw)
    {
        return pb.nchr;
    }

    return EOF;
}

#endif /* !_FS_READONLY */
#endif /* _USE_STRFUNC */

